Dr Tasaduk Hussain Itoo
Floods are among the most devastating natural disasters faced by humanity. They cause immediate destruction by sweeping away homes, damaging infrastructure, and displacing populations. But beyond the visible damage, floods carry an often-overlooked danger: the rise of infectious diseases. The true health crisis often begins once the waters recede, when contaminated environments, poor sanitation, and disrupted healthcare services create a fertile ground for outbreaks.
Waterborne Diseases:
One of the biggest health challenges after flooding is the contamination of drinking water. When sewage systems overflow and mix with floodwaters, harmful bacteria and viruses spread rapidly. This increases the risk of waterborne diseases such as cholera, typhoid, viral hepatitis-A, and acute diarrhoeal illnesses.
Flood victims, especially in rural or resource-poor settings, may rely on rivers, wells, or hand pumps that become unsafe during floods. Children and the elderly are particularly vulnerable, as dehydration from diarrhoeal illnesses can quickly turn fatal if left untreated.
Vector-Borne Illnesses:
Stagnant pools of water left behind after floods are perfect breeding sites for mosquitoes. As a result, outbreaks of malaria, dengue, and chikungunya often follow flood events. The spread of these vector-borne diseases further strains already overburdened health systems. Without timely vector control measures-such as drainage, spraying, and distribution of mosquito nets-flood-affected areas can experience epidemics.
Skin and Respiratory Infections:
Living conditions in temporary shelters also increase the risk of infections. Overcrowding, inadequate ventilation, and poor sanitation often result in skin rashes, fungal infections, respiratory tract infections, and even tuberculosis transmission. Injuries sustained during floods-such as cuts, bruises, and snakebites-frequently become infected due to lack of clean wound care facilities.
Secondary Impacts and Climate Change:
Floods disrupt livelihoods, displace populations, and create food insecurity, which in turn weakens immunity and increases vulnerability to infections. Climate change has intensified these risks by making extreme rainfall events more frequent and severe. Warmer temperatures and erratic monsoons across South Asia and other parts of the world now mean that flood-related infections are becoming a recurring public health concern.
The Way Forward:
Addressing the health fallout of floods requires both immediate and long-term strategies. In the short term, authorities must ensure access to clean drinking water through chlorination, water purification tablets, or bottled supplies. Mobile health camps should be deployed to provide quick diagnosis and treatment of diarrhoeal and vector-borne diseases. Preventive vaccination campaigns-particularly for hepatitis-A and typhoid-can reduce risks in vulnerable populations.
Vector control programs, safe sanitation practices, and widespread community awareness campaigns are equally critical. People must be educated on boiling water, washing hands, and using mosquito protection to reduce their risk of infection.
Conclusion:
Floods leave behind more than physical devastation; they create conditions for hidden epidemics that can claim as many lives as the disaster itself. Recognizing the connection between floods and infections is vital for disaster preparedness. By combining strong public health measures with climate-resilient planning, societies can reduce the risk of secondary health crises and safeguard vulnerable populations from the silent aftermath of floods.
(The author is Physician/Public Health Expert)
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