Why does cholera pandemic mainly spread during the rain season in Zimbabwe

Cholera pandemics mainly spread during the rainy season in Zimbabwe due to several interconnected factors that facilitate the fecal-oral transmission of the Vibrio cholerae bacteria:

• Contamination of Water Sources: Heavy rains often lead to flooding, which can wash human waste from overflowing pit latrines, inadequate sewage systems, and open defecation sites into communal water sources like wells, boreholes, and rivers. This contaminates the primary drinking water supply.
• Damaged Infrastructure: The rainy season can damage water and sanitation infrastructure, disrupting access to safe, piped water and making people rely on unsafe alternatives.
• Increased Water Runoff: Surface runoff during rains can carry the bacteria over wider areas, spreading contamination more easily.
• Displacement and Overcrowding: Flooding can displace communities, leading to temporary settlements with poor sanitation and overcrowding, which further accelerates disease transmission.

These conditions create an environment where the Vibrio cholerae bacteria can easily spread through contaminated water and food, leading to outbreaks.