The flu (virus) is not contagious by airborne means, but it is socially triggered by bio-resonance waves, by electro-chemical signals and by social imitation (see Thomas Cowan: The Contagion Theory and the video Germs Debunk Corona at Bitchute).
Moreover, many may have tuberculosis which is infectious in its active state. TB is a respiratory disease and has same symptoms as C-19, and those with TB are 30 x more susceptible to getting flu, pneumonia, hypoxia. The CDC counts TB as C-19.
As a Christian you thus should avoid those who are unclean, who defile the temple of God (their bodies), avoid and refuse to eat food with them or from them, and even report them to health authorities if necessary.
Scripture:
1Corinthians 5:9 I wrote to you in my letter to stop associating with people who are sexually immoral— 1Co 5:10 not at all meaning the people of this world who are immoral, greedy, robbers, or idolaters. In that case you would have to leave this world. 1Co 5:11 But now I am writing to you to stop associating with any so-called brother if he is sexually immoral, greedy, an idolater, a slanderer, a drunk, or a robber. You must even stop eating with someone like that. 1Co 5:12 After all, is it my business to judge outsiders? You are to judge those who are in the community, aren’t you? 1Co 5:13 God will judge outsiders. “Expel that wicked man.”
> 1Corinthians 5:9 I wrote to you in my letter to stop associating with people who are sexually immoral
Well that probably covers about 95% of males — Christian or not — under the age of 35. You better make sure you have a place to park all those walkers and rascal scooters when you have guests over for dinner. ;-)