The app has helped identify hotspots early and thus shown how big data can help India tackle covid-19 In the weeks following the terrorist attacks of 11 September 2001 in the US, letters containing anthrax spores were mailed to several media offices and legislators in that country.
The 2001 anthrax attacks, as they came to be called, killed five people and infected 17 others. But perhaps the most significant long-term consequence of these attacks was the creation of a system for early detection of the spread of a deadly disease that has since come to be used more widely in the context of infectious diseases.
The term syndromic surveillance is used to describe methods of detecting population health indicators that are discernible before