Covid-19 mostly effects who decrease immunity. Mostly affected people used alcohol and cigarette. Therefore we must increase our immunity.

Quarantine is best solution. Quarantine changes lot of things in our world. Such as, human's behavior, their relationships with their family even our environment changes. 

According the data, we can see lot of changes in our environment. There are ozone layer is recovered, decrease green house effects and decrease illegal fishing, firing, and migration etc. Include decrease noise pollution, light pollution and food wastes. This is good changes.

Although, many people are died by this pandemic. The correct medicine isn't discovered by anyone. This is our solution that HIV virus first attacked our immune system- T4 cells. After that our immunity is decreased. So who prevent with HIV they are died by other spreading diseases- fever, cough, flu or headache etc. 

Same as this novel Covid-19 pandemic virus also spread who have low immunity. We think that may be HIV treatment help to recover from this pandemic disease. This is our solution.

Next step is quarantine. We can't spend our home in our whole life. Many human factors also help to spread Covid-19. Most one is population density. Therefore every human must understand about self isolation. Don't make population density again. So we can manage it with timing. Every government can enforce new law  to it like

1. Don't gather more than 5 or 15 members.
2. Eat healthy food; reduced to use fast food.
3. If you go out, when you come again to their home they must wash or bath.
4. Everyone must use mask.
5. Every lab mustn't research any new micro-organisms.
6. Every one must understand in self isolation.

Like these law enforcement may be decreased in spread diseases from us.