Mumbai has seen a rise in malaria, dengue, chikungunya, and hepatitis cases, while gastroenteritis and leptospirosis declined, the BMC reported. From January-August, malaria cases rose to 5,706 and dengue to 2,319. The civic body inspected over 10 lakh houses, collected 1.8 lakh blood samples, and expanded awareness drives under its mosquito-control campaign.