Vit C
Good fresh Fruit , watermelons, bananas, ananas, peaches , vegetables, salads, or just a 2 or more tblts 500mg of Vit C p.q....
Distance
Carl Flügge 150 years ago discovered droplets and it s micro-drops contagiosness fr everything every dissease, then wearing mask , distance on closed on in spaces but outside on a summer in useless, nothing can survive heat termo effects in summer times ...
Sun
Sun Photons when temperature 7 days go toward 40-45-50C or 85-122F it makes dry air and water exhaustion that no organism can and host adapt to a summe powers then it s healthy or not it will help ..from FLU ...nobody gets FLU on summer at least normal FLU seasonal , on spring or in autumn like a Alergic Seasonal Conjuntivitis
Nature
In Natue , FLU as a living orgamism doesn t exist like a no oxygen in a vaccum space , it need a host , but any host on summer times is a different story ...Nature protects and cures all !
Sport
When someone swim or ride a bike , he overhear internal body with 60 C and it burnes cells, fat burning and everything inside and of course viruses too ...At least make them hard to adapt to temperature metabolic change , then sport is cool healthy stuff... Or just staying in NATURE !
Good Food
Strong Food , BARBEQUES, on a living fire made are so healthy and protective that make out body healthy and very very immune ...