Why Covid-19 Isn’t Just A Bad Version Of The Flu
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Here, let's take a look at five differences between flu and Covid-19. There are more. But, these will suffice.

1. Covid-19 is more transmissible than flu

Basic reproduction number, R0 - refers to expected number of cases directly generated by one case in a population where all individuals are susceptible to infection.

Most scientists think R0 of SARS-CoV-2 is around 3. CDC suggests that it is between 2 and 4. In contrast, R0 for seasonal flu has been estimated to be 1.28. Thus, SARS-CoV-2 is more than two times as transmissible as flu.

2. Covid-19 is more fatal than flu

Case fatality rate, the number of deaths per infection, is much greater with Covid-19.

In 2019-2020 flu season there were about one death for every 2000 symptomatic illnesses. In comparison, as of today there has been one death in the US for every 37 symptomatic cases of Covid-19. This means Covid-19 is 54 times more lethal than the flu.

3. We have more weapons against flu than Covid-19

Treatment for Covid-19 is an evolving science. Among four groups of antivirals (Remdesivir, Chloroquine/ Hydroxychloroquine, Lopinavir/Ritonavir and ivermectin) only Remdesivir is recommended by the FDA

In contrast, several drugs are available to treat the flu, including the very effective oseltamivir (Tamiflu®).

4. We don’t yet have a Covid-19 vaccine, but we have multiple flu vaccines

Currently, there are around 180 different vaccines for SARS-CoV-2 in various stages of development, but none is proved, approved. In comparison, at least eight different flu vaccines have been approved and are generally available.

5. The entire global population is susceptible to Covid-19

Finally, when Covid-19 entered the human population in November or December of 2019, there was no pre-existing immunity. In comparison, Flu immunity is complicated by the evolution of the flu virus, but even so a sizable fraction of the population is unlikely to contract influenza in any given year due to immunity from a prior infection.

Definitively, Covid-19 is not like the flu.

Source: https://www.forbes.com/sites/johndrake/2020/10/06/why-covid-19-isnt-just-a-bad-version-of-the-flu/#735d30ac1cc0
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