The state health department has formed a task force to investigate the rise in chikungunya cases and determine whether a new variant is responsible for the unusual symptoms. While Mumbai has seen a significant increase in cases compared to last year, the task force was established amid concerns that a viral strain in Pune may be causing more severe illness.

The health department clarified that reports of new symptoms, such as neurological issues, paralysis, and hyperpigmentation—dark patches on the face and nose—are not unprecedented. These symptoms have been observed in the past, especially in patients co-infected with other illnesses like dengue, Zika, or Japanese encephalitis.