Using the design and key of the figure as a model, select all statements that represent changes that occurred when the novel coronavirus appeared in the population. There was protection for the most vulnerable people in the population due to herd immunity. O Complex chains of disease transmission (red arrows) appeared. There were more unvaccinated people (gray), more infected people (red), and no vaccinated people (blue) in the population. O There was community spread of the infectious disease due to a lack of herd immunity. O Disease outbreaks were contained due to herd immunity.

Emerging viruses that suddenly become apparent in causing widespread disease are actually caused by the spread of existing viruses to new host species. mutation of existing viruses. all of the other answers together are correct the spread of existing viruses more widely within their host species.

Why do we use such terms as infectious  particles, agents, or active or inactive when referring to viruses?

Which of the following is NOT true about Severe Acute Respiratory Syndrome Coronavirus 2 (SARS-CoV-2) and the disease it causes? Which option is the answer: 1. During Coronavirus Disease (COVID-19), a person is the most highly infectious for others during the period of peak viral load and symptoms 2. As it is transmitted through the global human population, the virus is highly genetically stable and does not change 3. Some people who become infected with SARS-CoV-2 will not develop signs and/or symptoms of disease 4. The severity of disease varies greatly, depending on age and/or underlying predisposing conditions 5. Emerging SARS-CoV-2 variants may sometimes be more transmissible than previous strains