Over 29.5 million people across the globe have been diagnosed with covid-19, the disease caused by the new respiratory virus, according to data compiled by the Center for Systems Science and Engineering at Johns Hopkins University. The criteria for diagnosis -- through clinical means or a lab test -- has varied from country-to-country. Still, the actual numbers are believed to be much higher due to testing shortages, many unreported cases and suspicions that some national governments are hiding or downplaying the scope of their outbreaks.
Since the first cases were detected in China in December, the virus has rapidly spread to every continent except Antarctica.
The United States is the worst-affected country, with more than 6.6 million diagnosed cases and at least 195,942 deaths.
California has the most cases of any US state, with more than 768,000 people diagnosed, according to Johns Hopkins data. California is followed by Texas and Florida, with over 692,000 cases and over 668,000 cases, respectively.
Nearly 170 vaccine candidates for covid-19 are being tracked by the World Health Organization, at least six of which are in crucial phase three trials.
Source: ABC News