In early May, doctors in India began raising the alarm about a rise in mucormycosis - a rare and potentially deadly infection also known as black fungus.

Many of those being infected are coronavirus patients, or those who have recently recovered from COVID-19, whose immune systems have been weakened by the virus or who have underlying conditions - most notably diabetes.

In the past few weeks, thousands of black fungus cases have been reported across the country, with hundreds hospitalised and at least 90 dead.