Prolonged heavy rain and flooding in Hà Nội and northern provinces have created a severe public health crisis, dramatically increasing the risk of infectious diseases as residents and sanitation workers come into contact with contaminated water, mud, and waste. According to Dr. Nguyễn Quốc Phương, head of the Infection Control Department at the National Hospital for Tropical Diseases, these hazards are driven by floodwaters that pick up sewage, rubbish, and animal carcasses during clean-up operations.
Biological Hazards and Waterborne Infections in Contaminated Floodwaters
The spectrum of post-flood illness is broad, with infection risks depending heavily on direct exposure to polluted mud and water, particularly in rural and low-lying agricultural communities. Viral pathogens such as norovirus, hepatitis A, and rotavirus increase due to compromised sanitation systems, while parasitic illnesses like Cryptosporidium and Giardia present heightened waterborne risks.
Among the most pressing bacterial threats is leptospirosis. The bacteria can be present in water and mud contaminated by animal urine, particularly from rats, and enters the body through cuts or abrasions. Dr. Phương notes that symptoms include fever, headache, and muscle pain, especially in the calves, while severe cases can cause jaundice, reduced urine output, and liver or kidney damage.
Soil-Dwelling Threats and Gastrointestinal Complications
Another major concern during the rainy season is Whitmore disease, or melioidosis. Caused by the Burkholderia pseudomallei bacteria found in soil and water, it can enter through wounds or be inhaled, causing prolonged fever, skin abscesses, pneumonia, or sepsis. The National Hospital for Tropical Diseases continues to treat sporadic cases during the rainy season, according to Dr. Phương.
Compromised drinking water supplies and spoiled food propel gastrointestinal disease rates upward. Dysentery, typhoid, cholera, and hepatitis A frequently cause widespread vomiting, abdominal pain, and severe diarrhea. Authorities advise consuming only treated water, ensuring meals are thoroughly cooked, and throwing away any provisions that came into contact with floodwaters.
Post-Flood Complacency and Vector-Borne Outbreaks
Experts warn that people should not become complacent after floodwaters recede. Regina LaRocque, an associate professor of medicine at Massachusetts General Hospital, points out that medical professionals must maintain high watchfulness concerning water- and vector-related sicknesses, given that standing water left behind in containers and tires transforms into mosquito breeding grounds, thereby elevating dengue hazards in the ensuing weeks.
The Underappreciated Psychological Toll of Flooding
While physical infections demand immediate medical notice, investigators emphasize that the psychological repercussions of floods remain their most overlooked effect. Statistics reveal that as many as 75% of flood victims experience psychological difficulties, spanning from short-term trauma and sleeplessness to severe anxiety, depression, and post-traumatic stress disorder. Patrick Vinck, an assistant professor of emergency medicine at Brigham and Women’s Hospital, points out that repeated exposure to smaller, recurring flood events steadily erodes mental well-being and overall quality of life.
Did you know? Floods account for about half of all deaths related to natural disasters worldwide each year, with the greatest dangers frequently unfolding in the days, weeks, and months following the initial disaster.
Frequently Asked Questions
What are the primary disease risks after flooding?
The primary risks include waterborne bacterial infections like leptospirosis, soil-dwelling threats such as melioidosis, gastrointestinal illnesses including typhoid and cholera, and vector-borne diseases like dengue fever.
How can residents protect themselves during flood clean-up operations?
Residents should avoid unnecessary contact with dirty floodwater, wear boots and gloves, cover wounds, drink safe water, eat thoroughly cooked food, and wash hands regularly.
What mental health impacts are associated with flooding?
Studies indicate that up to 75% of people affected by flooding suffer from mental health problems, ranging from acute anxiety and depression to post-traumatic stress disorder.
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