Wednesday's waterlogging raised the fear of leptospirosis and other monsoon-related ailments, especially with a large number of people wading through flooded tracks infested with rodents. Civic hospitals have been put on alert.

"Till late evening, no untoward incident was reported," said Dr Rajani Jaqtab, CMO, Veer Savarkar Municipal Hospital. "Flood water is a mixture of rain and sewage water, which contains dangerous organisms," said Dr Ketan Vagholkar, DY Patil Hospital, Nerul, which was partly flooded. "Spiro organisms present in rodent urine entering the human body can cause gastro or even haemorrhagic fever, including lepton and skin infection."