From harvard website, not sure how up to date.
Can a person who has had coronavirus get infected again?
While we don't know the answer yet, most people would likely develop at least short-term immunity to the specific coronavirus that causes COVID-19. However, you would still be susceptible to a different coronavirus infection. Or, this particular virus could mutate, just like the influenza virus does each year. Often these mutations change the virus enough to make you susceptible, because your immune system thinks it is an infection that it has never seen before.
How long can the coronavirus that causes COVID-19 survive on surfaces?
We don't yet know how long the coronavirus can survive on surfaces such as plastic, porcelain, granite, steel, or copper. In the meantime, the CDC recommends cleaning frequently touched surfaces and objects every day. These include counters, tabletops, doorknobs, bathroom fixtures, toilets, phones, keyboards, tablets, and bedside tables.
If surfaces are dirty, first clean them using a detergent and water, then disinfect them. A list of products suitable for use against COVID-19 is available here. This list has been pre-approved by the U.S. Environmental Protection Agency (EPA) for use during the COVID-19 outbreak.
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