INTRODUCTION:

Biological weapons are harmful organisms or toxins created to cause illness, death, or harm to people, animals, or plants. They pose a serious threat to global health, national security, and economies.¹

Historically, biological weapons have been used in various ways, from ancient times when contaminated water and sick animals were used, to modern threats involving genetically modified germs. In the 20th century, countries like the United States and the Soviet Union developed advanced biological warfare programs.^2,3

Today, advances in biotechnology and genetic engineering raise concerns about the potential misuse of these technologies for bioterrorism. The spread of infectious diseases and our interconnected world make it crucial to understand how biological weapons affect human health.⁴

This review will provide a thorough overview of the impacts of biological weapons on health, including:

1. Key biological agents and how they spread.

2. Symptoms and diagnosis of infections.

3. Psychological and economic effects.

4. Challenges in responding to attacks.

5. Strategies for prevention and preparedness.

By examining the serious consequences of biological weapons, this review aims to:

1. Inform healthcare workers, policymakers, and public health officials.

2. Identify research gaps for future studies.

3. Stress the importance of international cooperation

Thesis Statement:

Understanding the effects of biological weapons on human health is essential for developing effective responses, reducing the impacts of attacks, and ensuring global health safety.

Types of Biological Agents:

Fig. 1 – Types of Bacterial Agents⁵

Bacterial Agents:

1. Anthrax (Bacillus anthracis)

Anthrax

Bacillus anthracis is a spore-forming bacterium that can infect humans through inhalation, direct skin exposure, or ingestion.

· Inhalational anthrax presents with severe respiratory distress and is often fatal without prompt treatment.

· Cutaneous anthrax is characterized by the development of painless skin lesions that progress to ulcers with black centers.

· Gastrointestinal anthrax, though rare, leads to abdominal pain, vomiting, and bloody diarrhea, typically following the ingestion of contaminated food products.⁶

2. Plague (Yersinia pestis):

Plague

Yersinia pestis, historically known for causing pandemics, is transmitted via infected flea bites, respiratory droplets, or direct contact with contaminated tissue.

· Bubonic plague involves the sudden onset of fever and the appearance of swollen, tender lymph nodes (buboes).

· Pneumonic plague targets the lungs, resulting in symptoms such as cough, shortness of breath, and chest pain.

· Septicemic plague spreads through the bloodstream, leading to fever, abdominal pain, and in some cases, internal bleeding.⁷

3. Tularemia (Francisella tularensis):

Tularemia

This zoonotic pathogen can be acquired through tick bites, handling infected animals, or inhaling the bacteria.

· The ulceroglandular form is the most common, marked by skin ulcers at the entry site and regional lymphadenopathy.

· The pneumonic form arises from inhalation and causes symptoms such as chest pain, cough, and difficulty breathing.

· Typhoidal tularemia is a systemic variant with nonspecific symptoms including high fever, gastrointestinal discomfort, and weakness.⁸

4. Brucellosis (Brucella spp.):

Brucellosis

Infection occurs via ingestion of unpasteurized dairy products, inhalation of aerosols, or contact with infected animals or their secretions.

Brucellosis manifests with undulating fever, malaise, arthralgia, and headache. The disease can become chronic and lead to complications involving the bones, joints, or cardiovascular system.⁹

5. Glanders (Burkholderia mallei):

Primarily affecting equines, Burkholderia mallei can infect humans through direct contact or inhalation.

Human glanders may present with fever, muscle aches, and ulcerative skin lesions. In more severe cases, pneumonia and systemic infection can develop, often with high mortality if untreated.¹⁰

6. Melioidosis (Burkholderia pseudomallei):

Melidosis

This environmental bacterium is endemic in tropical regions and can be acquired through contact with contaminated soil or water, or by inhalation of the bacteria. Melioidosis may cause a wide spectrum of illness ranging from localized skin infections to severe pneumonia and septicemia. The clinical presentation is often nonspecific, complicating diagnosis and management.¹¹

Viral Agents:

1. Smallpox (Variola major):

Smallpox

Smallpox is a highly contagious and deadly disease caused by the variola virus. Transmission occurs primarily through inhalation of respiratory droplets from an infected individual or via direct contact with contaminated materials. The disease is characterized by an abrupt onset of fever, followed by a distinctive rash that progresses to pustules and scabs. Historically, smallpox had a high mortality rate, particularly among unvaccinated populations. The World Health Organization declared smallpox eradicated in 1980, following a successful global vaccination campaign.¹²

2. Ebola Virus Disease (EVD):

Ebola Virus

EVD is a severe and often fatal illness caused by the Ebola virus. Initial transmission to humans is believed to occur through contact with infected animals, such as fruit bats or primates. Subsequent human-to-human transmission happens through direct contact with bodily fluids of an infected person or contaminated objects. Symptoms include sudden onset of fever, fatigue, muscle pain, headache, and sore throat, followed by vomiting, diarrhea, rash, and in some cases, internal and external bleeding. The case fatality rate varies between 25% and 90%, depending on the virus strain and the quality of medical care available.¹³

3. Marburg Virus Disease (MVD):

Marburg Virus Disease

MVD is a rare but severe hemorrhagic fever caused by the Marburg virus, closely related to the Ebola virus. The natural host of the virus is the Rousettus fruit bat, with human infection resulting from prolonged exposure to mines or caves inhabited by these bats. Human-to-human transmission occurs through direct contact with the blood, secretions, organs, or other bodily fluids of infected persons, or with surfaces and materials contaminated with these fluids. Symptoms begin abruptly with high fever, severe headache, and malaise, followed by watery diarrhea, abdominal pain, and cramping. Bleeding manifestations may appear between days 5 and 7. The average case fatality rate is around 50%, but it has varied from 24% to 88% in past outbreaks.¹⁴

4. Lassa fever:

Lassa fever

Lassa fever is an acute viral hemorrhagic illness caused by the Lassa virus, primarily transmitted to humans via contact with food or household items contaminated with rodent urine or feces. Person-to-person transmission can also occur, particularly in healthcare settings lacking adequate infection prevention and control measures. Symptoms typically begin with fever, general weakness, and malaise, followed by headache, sore throat, muscle pain, chest pain, nausea, vomiting, diarrhea, cough, and abdominal pain. In severe cases, facial swelling, fluid in the lung cavity, bleeding from the mouth, nose, vagina, or gastrointestinal tract, and low blood pressure may develop. The overall case fatality rate is 1%, but among hospitalized patients with severe disease, it can be 15% or higher.¹⁵

5. Hantavirus Pulmonary Syndrome (HPS) :

Hantavirus Pulmonary Disease

HPS is a severe respiratory disease caused by hanta viruses, primarily transmitted to humans through inhalation of aerosolized virus particles from rodent urine, droppings, or saliva. Person-to-person transmission has been reported with certain strains, such as the Andes virus. Early symptoms include fatigue, fever, and muscle aches, followed by dizziness, chills, abdominal pain, and shortness of breath. As the disease progresses, lungs fill with fluid, leading to respiratory failure. Without prompt medical attention, HPS can be fatal.¹⁶

Toxin Agents:

1. Botulinum Toxin (Produced by Clostridium botulinum):

Botulinum Toxin

This highly potent neurotoxin can enter the body through contaminated food or by inhalation. Once inside, it disrupts nerve function by blocking the release of acetylcholine, leading to progressive muscle weakness. In severe cases, this results in respiratory muscle paralysis, which can be fatal without immediate medical intervention.¹⁷

2. Ricin Toxin (Derived from Ricinus communis, the Castor Bean Plant):

Ricin Toxin

Ricin is a naturally occurring toxic protein that poses a serious health threat when ingested or inhaled. It inhibits protein synthesis at the cellular level, leading to widespread tissue damage. Symptoms typically involve severe gastrointestinal distress followed by respiratory failure, depending on the exposure route and dosage.¹⁸

3. Tetrodotoxin (Found in Pufferfish – Family Tetraodontidae):

Tetrodotoxin:

This marine neurotoxin is commonly associated with the consumption of improperly prepared pufferfish. It acts by blocking sodium channels in nerve cells, effectively halting nerve signal transmission. Clinical manifestations include numbness, paralysis, and in extreme cases, respiratory arrest.¹⁹

4. Saxitoxin (Produced by Marine Dinoflagellates such as Gonyaulax catenella):

Saxitoxin

Saxitoxin is a naturally occurring toxin implicated in paralytic shellfish poisoning (PSP). Human exposure usually occurs through consumption of shellfish that have bioaccumulated the toxin. It impedes nerve conduction by targeting voltage-gated sodium channels, leading to symptoms like tingling, muscular paralysis, and potentially life-threatening respiratory failure.²⁰

Fungal Agents:

1. Coccidioidomycosis (Coccidioides species):

Coccidioimycosis

This fungal infection is acquired through airborne spores, typically inhaled from disturbed soil. It commonly presents with flu-like symptoms, including persistent cough and fever, and may also cause skin manifestations.²¹

2. Aspergillosis (Aspergillus species):

Aspergillosis

Primarily affecting individuals with weakened immune systems, this disease arises from inhaling fungal spores. It often results in respiratory distress, fever, and cough, and in advanced cases, can progress to a severe form that invades organs.²²

Physiological Impact of Biological Weapons:

Biological weapons possess the capacity to inflict extensive and often irreversible damage across various human physiological systems. These agents, whether bacterial, viral, or toxic in nature, can lead to both acute and chronic health complications depending on the route of exposure, individual susceptibility, and the virulence of the agent involved.

1. Respiratory System:

The respiratory tract is one of the most common portals of entry for biological agents. Inhalational anthrax, caused by Bacillus anthracis, leads to a severe and rapidly progressing lung infection. Individuals often present with difficulty breathing, high fever, and chest discomfort that can progress to respiratory failure. Pneumonic plague, due to Yersinia pestis, causes intense inflammation in the lungs, with symptoms such as severe coughing, bloody sputum, and respiratory collapse. Tularemia, when inhaled, may mimic bacterial pneumonia and often causes coughing, chest tightness, and breathing difficulties. Influenza-like viruses, including H5N1 and H1N1 strains, can provoke pneumonia, respiratory distress, and in serious cases, multi-lobe lung involvement leading to respiratory failure.²³

2. Nervous System:

Biological toxins like botulinum and tetrodotoxin act directly on the nervous system. Botulinum toxin inhibits nerve signaling, resulting in progressive muscle weakness, facial paralysis, and potentially fatal respiratory muscle involvement. Ricin, a potent plant toxin, can also interfere with nerve signaling and provoke seizures and coma in high doses. Tetrodotoxin, often derived from pufferfish, causes rapid-onset paralysis, affecting both voluntary and involuntary muscles, and can lead to heart and respiratory arrest if untreated.²⁴

3. Gastrointestinal System:

When biological agents enter the digestive tract, they can produce a spectrum of gastrointestinal symptoms. Gastrointestinal anthrax can cause intense abdominal pain, nausea, vomiting, and severe, often bloody diarrhea, due to the necrosis of intestinal tissues. Tularaemia, though primarily a respiratory pathogen, can also affect the gastrointestinal tract, leading to stomach cramps, vomiting, and loose stools. Haemorrhagic fevers such as Ebola and Marburg are associated with gastrointestinal bleeding, profuse diarrhoea, and vomiting, often leading to extreme fluid loss and electrolyte imbalance.²⁵

4. Cardiovascular System:

Some agents can profoundly disturb the cardiovascular system. Anthrax toxins are known to impair cardiac function and can result in circulatory collapse and shock. Plague, particularly in its septicaemia form, can spread rapidly through the bloodstream, causing disseminated infection and cardiovascular instability. Ricin exposure can directly affect the heart by disrupting protein synthesis in myocardial cells, potentially leading to arrhythmias or cardiac arrest.²⁶

5. Dermatological Effects:

Certain pathogens visibly affect the skin, either through direct inoculation or systemic spread. Cutaneous anthrax is marked by the formation of black-centered ulcers, often surrounded by swelling and blisters. Smallpox infection typically presents with a characteristic rash that progresses through various stages, from macules to pustules, eventually forming scabs. Tularaemia can manifest as ulcer glandular disease, producing painful skin ulcers at the site of entry and swollen regional lymph nodes.²⁷

6. Musculoskeletal Effects:

Muscle and joint involvement can occur as secondary symptoms or direct effects of certain biological agents. Ebola and Marburg infections often begin with intense muscle aches, fatigue, and general weakness. Anthrax, particularly systemic forms, may also lead to musculoskeletal weakness due to widespread toxin circulation and inflammation.²⁸

7. Haematological Effects:

Biological agents can also interfere with blood components and clotting systems. Viral haemorrhagic fevers such as Ebola and Marburg disrupt blood vessel integrity, leading to internal and external bleeding, petechial, and bruising. Anthrax may cause bleeding complications, especially during the late stages of infection, as the bacteria and its toxins damage vascular and lung tissues.²⁹

8. Immunological Effects:

Some pathogens and toxins directly compromise the immune system. For instance, Ebola and Marburg viruses are known to target immune cells, particularly dendritic cells and macrophages, leading to immune evasion and dysfunction. Ricin, when inhaled or ingested, can inhibit protein synthesis in immune cells, reducing the body’s ability to mount an effective defence.³⁰

9. Multi-Organ Failure:

In severe cases, biological agents can precipitate widespread organ dysfunction. Conditions like sepsis and systemic inflammation may develop, progressing to failure of critical organs such as the kidneys, liver, heart, and lungs. This multi-organ failure is a common terminal event in high-mortality infections like Ebola, anthrax, or advanced plague.³¹

10. Long-Term Effects:

Survivors of biological attacks may suffer from prolonged or permanent health issues. Chronic lung disease can result from pulmonary damage due to anthrax or viral pneumonia. Nerve damage caused by neurotoxins or encephalitic viruses may lead to long-term motor or cognitive deficits. Additionally, many survivors report psychological trauma, including post-traumatic stress disorder (PTSD), especially in mass casualty or bioterrorism events.³²

11. Vulnerable Populations:

Certain populations are at greater risk of severe outcomes following exposure to biological agents. These include infants and young children, the elderly, pregnant women, and individuals with pre-existing health conditions or weakened immune systems. These groups may experience faster disease progression, reduced treatment efficacy, and higher fatality rates.³³

Challenges in Responding to Biological Threats:

Responding effectively to a biological attack or outbreak presents a complex set of challenges that span clinical, logistical, ethical, and social domains. The unpredictable nature of biological agents and their potential for rapid spread demand a highly coordinated and adaptive response, which is often difficult to achieve under emergency conditions.

1. Difficulty in Rapid Detection and Diagnosis:

Timely identification of biological agents is critical for containment and treatment, yet it remains a major hurdle. Many biological threats initially present with symptoms that mimic common illnesses, delaying recognition. Limited availability of rapid diagnostic tools and the need for specialized laboratory testing further complicate early detection, increasing the risk of widespread transmission before the true nature of the threat is understood.

2. Insufficient Availability of Medical Countermeasures:

Another major challenge is the limited supply of effective vaccines, antidotes, and therapeutic agents for many high-risk biological threats. In some cases, such as with emerging or genetically modified pathogens, approved treatments may not even exist. Even when countermeasures are available, production, stockpiling, and equitable distribution remain logistical and ethical challenges, especially in low-resource settings.

3. Risk of Rapid and Extensive Spread:

Biological agents can disseminate quickly through populations, especially those transmitted via air or direct contact. Urban environments, international travel, and mass gatherings can accelerate spread, making containment efforts significantly more complex. Once widespread, the infection can overwhelm healthcare systems and strain public health infrastructure.

4. Difficulty in Differentiating between Natural and Deliberate Outbreaks

Determining whether an outbreak has arisen from natural causes or intentional release is a critical but challenging task. Biological attacks may be designed to mimic naturally occurring diseases, obscuring attribution. This ambiguity can delay appropriate security responses and complicate public communication strategies.

5. Complexities in Interagency Coordination:

Effective response often requires cooperation among diverse sectors, including healthcare, emergency management, law enforcement, intelligence, and government leadership. Aligning the objectives, communication systems, and operational procedures of these groups can be difficult, especially under crisis conditions. A lack of clear leadership or jurisdictional overlap can hinder timely decision-making.

7. Ethical Dilemmas in Balancing Public Health and Civil Liberties:

In the face of biological emergencies, governments may be required to implement measures such as quarantines, movement restrictions, or mandatory vaccinations. While necessary to protect the public, these interventions can conflict with individual rights and freedoms, raising ethical concerns about consent, privacy, and equity.

8. Managing Public Anxiety and Social Response:

Widespread fear and uncertainty often accompany biological incidents. Misinformation, rumours, and panic can spread faster than the pathogen itself, undermining trust in public health authorities and impeding response efforts. Clear, transparent, and culturally sensitive communication is essential to maintain public confidence and encourage compliance with protective measures.³⁴

Strategic Responses to Biological Threats:

Effectively responding to biological incidents—whether naturally occurring or intentional—requires a comprehensive, multi-phased strategy that incorporates preparedness, real-time response, recovery, and long-term mitigation. Coordinated efforts from local, national, and international stakeholders are essential to minimize health impacts, control disease spread, and restore societal function. The strategies discussed below offer a framework for building robust biological threat response capabilities.

Pre-Event Preparedness:

Preparedness forms the cornerstone of effective biological defence. Emergency response plans should be routinely updated to reflect emerging threats, technological developments, and lessons learned from previous incidents. Simulation exercises and interagency drills enhance readiness by ensuring that personnel are familiar with their roles in crisis scenarios. Establishing integrated communication systems enables real-time coordination between health authorities, emergency responders, and government agencies. In addition, maintaining stockpiles of essential medical supplies—including vaccines, antibiotics, antivirals, and personal protective equipment (PPE)—ensures timely access during emergencies. Finally, strengthening disease surveillance networks and early warning systems allows for prompt detection of unusual patterns or outbreaks, enabling a rapid response.³⁵

Event Response:

When a biological event occurs, the immediate activation of emergency operations is critical. Incident command systems should be triggered swiftly, and relevant authorities notified to initiate a coordinated response. Rapid risk assessment, including identifying the causative agent, transmission mode, and population at risk, is essential for guiding containment strategies. Public health measures such as quarantine, isolation, travel restrictions, and distribution of prophylactic treatments may be implemented to curb disease spread. Concurrently, healthcare facilities must provide appropriate clinical care, which may include supportive treatments, specific therapies, or antitoxins. Environmental decontamination—cleaning of affected surfaces, infrastructure, and air systems—may also be necessary to eliminate residual hazards.³⁶

Post-Event Recovery:

Recovery efforts focus on restoring stability and ensuring that affected communities return to normalcy. A thorough investigation of the incident helps determine the source, mode of transmission, and potential lapses in response, guiding future improvements. Essential services such as water, electricity, transportation, and healthcare infrastructure must be re-established promptly. Psychological support and mental health services play a vital role in addressing trauma, grief, and social disruption caused by the event. Post-incident evaluations provide an opportunity to refine emergency protocols and response plans. Building long-term community resilience—through education, health literacy, and capacity-building—ensures improved preparedness for future biological threats. ³⁷

Medical Countermeasures:

Medical interventions are a central component of biological response strategies. Vaccines serve as a preventive measure for certain pathogens and are most effective when administered pre- or immediately post-exposure. For ongoing infections, therapeutic interventions such as antibiotics, antivirals, and monoclonal antibodies are essential to reduce morbidity and mortality. In cases involving biological toxins, antitoxins may neutralize the harmful effects. Supportive care, including the use of ventilators, intravenous fluids, and oxygen therapy, is critical for managing severe symptoms and complications, especially in high-risk or critically ill patients.³⁸

Public Health Strategies:

To effectively manage and contain outbreaks, public health systems must implement a range of interventions. Continuous monitoring through epidemiological surveillance helps detect unusual disease trends and triggers early response. Contact tracing identifies those who may have been exposed, enabling targeted testing, isolation, and prophylaxis. Enforced quarantine and isolation help limit further transmission, while social distancing measures reduce opportunities for community spread. Clear, consistent, and transparent communication with the public is crucial to promote trust, counter misinformation, and encourage compliance with health directives.³⁹

International Cooperation:

Given the global nature of biological threats, international collaboration is essential. Countries should engage in regular sharing of intelligence, threat assessments, and laboratory findings. Coordinated response plans, including mutual aid agreements and resource-sharing protocols, can enhance efficiency and reduce duplication of efforts. Global organizations can help pool logistics, deploy rapid response teams, and coordinate distribution of medical countermeasures. Standardization of public health guidelines, border policies, and quarantine procedures facilitates cohesive action across nations and supports global health security.⁴⁰

Technological Advancements:

Modern technologies play an increasingly significant role in strengthening response capacity. Rapid, point-of-care diagnostic tests enable quicker identification of pathogens at the site of care, enhancing early detection. Improved PPE designs offer better protection and comfort for frontline workers. Artificial intelligence and big data analytics are being harnessed to predict outbreak patterns, identify hotspots, and optimize resource deployment. In remote or underserved areas, mobile health units and telemedicine platforms extend healthcare access and allow for remote monitoring and consultation during outbreaks.⁴¹

Ethical Considerations:

Ethical principles must guide every stage of a biological response. Public health interventions must carefully balance the protection of community health with respect for individual autonomy and civil liberties. Equitable access to vaccines, treatments, and healthcare services must be prioritized, especially for marginalized or high-risk populations. Cultural sensitivity should be maintained when implementing health measures, ensuring that policies do not infringe upon religious or social norms. Additionally, transparency in decision-making helps prevent conflicts of interest and fosters public trust in health authorities. ⁴²

CONCLUSION:

Biological weapons represent a profound and evolving threat to public health, national security, and global stability. Their ability to cause mass casualties, disrupt societies, and paralyze economies underscores the urgent need for coordinated international preparedness and response. These weapons, whether naturally derived or synthetically engineered, possess the potential to exploit vulnerabilities in both civilian populations and healthcare systems, especially in the absence of timely detection and countermeasures.

This review has explored the diverse range of biological agents, detailing their transmission routes, clinical manifestations, and systemic physiological effects. From respiratory compromise and neurological damage to multi-organ failure, these agents can induce severe health consequences with both immediate and long-term implications.

Beyond the direct health impacts, biological attacks can significantly strain healthcare infrastructure, incite public fear, and trigger social and economic instability. Managing such crises requires overcoming complex challenges—including delayed diagnosis, limited medical resources, ethical dilemmas, and coordination difficulties across sectors and borders.

To counter these risks, comprehensive response strategies must be implemented. These include pre-event planning and training, rapid mobilization of emergency systems during an outbreak, and long-term recovery efforts to rebuild community resilience. Medical countermeasures, robust public health interventions, and technological innovations further strengthen our capacity to respond effectively. Equally important is the role of ethical decision-making and global cooperation in ensuring fair, transparent, and culturally sensitive actions during biological emergencies.

In light of the increasing accessibility of biotechnological tools and the unpredictable nature of emerging pathogens, the threat of biological weapons cannot be underestimated. Proactive investment in preparedness, international collaboration, and continuous evaluation of response strategies is essential to safeguard public health and maintain global security in the face of biological threats.

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Received on 03.05.2025 Revised on 24.08.2025

Accepted on 01.11.2025 Published on 20.01.2026

Available online from January 27, 2026

Asian J. Pharm. Tech. 2026; 16(1):30-38.

DOI: 10.52711/2231-5713.2026.00006

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