Question

SARS-Cov-2 also referred to as Coronavirus, the novel Coronavirus is the virus that causes the disease COVID or COVID-19. It is the causative agent of the pandemic that we are currently living in. The pandemic is a

• How is a pandemic different than an epidemic? At what point was COVID-19 declared a pandemic?
• Early on in the pandemic, official guidance from the CDC and other health organizations was that individuals did not need to wear a mask. Why do you think this has changed over time? I am not asking you if you choose to disregard this advice; I am asking you why at a scientific level, the advice has changed.
• What is an Ro number? Why is it more of a concerning factor with COVID-19 than it is for influenza?
• Why is it important to implement contact tracing from an epidemiological perspective?
• What is herd immunity? How might it impact COVID-19 one year from now?
• Why might a vaccine against the Coronavirus be effective? Why might it be ineffective?

Answer 1

A pandemic is an epidemic that affects over multiple countries or continents,Epidemic is a type of disease that affects a large number of persons within the community of a particular area.

The Covid 19 first discovered in the China and within few months it reported every nations and continents.

The covid 19 is a droplet and airborn disease so wearing appropriate mask and washing hands will help to prevent the disease.

The RO number denotes the how contagious a communicable disease

Herd immunity is the resistance to the spread of an communicable disease within a population that is based on the preexisting immunity as a result of vaccination or previous infection.