The development of COVID-19 tests was a major public health priority during the early months of the COVID-19 pandemic. In such an approach, diagnostics is the most crucial tool helping to identify the disease cases leading to isolation as well as contact tracing, thereby preventing other people from coming in contact with the patients or their recent contacts. But all of these therapeutic strategies cannot offer complete protection against COVID-19 paving way for epidemiological approaches to break the chain of disease transmission. Vaccines seem promising and currently include Pfizer-BioNTech vaccine, Moderna vaccine, Oxford/AstraZeneca vaccine, and the Janssen vaccine. Hence, developing a therapy against COVID-19 was progressing at a pandemic speed, yet there is no effective therapy approved by food and drug administration (FDA). Evidence from studies suggests that SARS-CoV-2 aerosols can stay viable in air for about 3 hours, have a half-life of about 1 hour and can survive for more time on steel and plastic while compared to cardboard and copper. The viral deposition occurs on mucous membranes of nose, mouth, or eyes via sprays and splashes or direct contact with hands contaminated with SARS-CoV-2 either by respiratory fluids or by touching surfaces contaminated with the virus. The COVID-19 transmission is rapid and occurs via inhalation of respiratory droplets or aerosol particles contaminated with SARS-CoV-2. Introduction Timeline of total number of tests in different countries
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