From your Lancet piece, Kevin:

"Mucormycosis is caused by ubiquitous environmental moulds with a global distribution, including the Rhizopus, Apophysomyces, Mucor, and Lichtheimia species. Although generally harmless to an immunocompetent host, the infection can be deadly in patients with an impaired immune system, such as in those with haematological malignancies or poorly controlled diabetes, or in individuals receiving steroids or other immunosuppressants."

The article goes on to state that there were 11700 cases being treated in India on a date last May. Well the population of India is over 1.3 billion people. So it's a very rare disease, despite the ubiquitous nature of the fungal spores in question, that generally only affects people with underlying conditions. We're constantly battling old and new infection agents and 'twas ever thus. We shouldn't be complacent, but neither should we be unduly alarmist.