Here’s how long the coronavirus will last on surfaces, and how to disinfect those surfaces.
As the coronavirus outbreak continues to accelerate in the U.S., cleaning supplies are disappearing off the shelves and people are worried about every subway rail, kitchen counter and toilet seat they touch. 
But how long can the new coronavirus linger on surfaces, anyway? The short answer is, we don't know. A new analysis found that the virus can remain viable in the air for up to 3 hours, on copper for up to 4 hours, on cardboard up to 24 hours and on plastic and stainless steel up to 72 hours. This study was originally published in the preprint database medRxiv on March 11,  and now a revised version was published March 17 in The New England Journal of Medicine. 
What's more, SARS-CoV-2 RNA was found on "a variety of surfaces" in cabins of both symptomatic and asymptomatic people who were infected with COVID-19 on the Diamond Princess cruise ship, up to 17 days after the passengers disembarked, according to a new analysis from the Centers for Disease Control and Prevention (CDC). However, this was before disinfection procedures took place and "data cannot be used to determine whether transmission occurred from contaminated surfaces," according to the analysis. In other words, it's not clear if the viral particles on these surfaces could have infected people.
Another study published in February in The Journal of Hospital Infection analyzed several dozen previously published papers on human coronaviruses (other than the new coronavirus) to get a better idea of how long they can survive outside of the body. 
They concluded that if this new coronavirus resembles other human coronaviruses, such as its "cousins" that cause SARS and MERS, it can stay on surfaces —  such as metal, glass or plastic — for as long as nine days (In comparison, flu viruses can last on surfaces for only about 48 hours.)
But some of them don't remain active for as long at temperatures higher than 86 degrees Fahrenheit (30 degrees Celsius). The authors also found that these coronaviruses can be effectively wiped away by household disinfectants. 
For example, disinfectants with 62-71% ethanol, 0.5% hydrogen peroxide or 0.1% sodium hypochlorite (bleach) can "efficiently" inactivate coronaviruses within a minute, according to the study. "We expect a similar effect against the 2019-nCoV," the researchers wrote, referring to the new coronavirus. But even though the new coronavirus is a similar strain to the SARS coronavirus, it's not clear if it will behave the same.
Diluted household bleach solutions, alcohol solutions containing at least 70% alcohol and most EPA-registered common household disinfectants should be effective at disinfecting surfaces against the coronavirus, according to the CDC. The bleach solution can be prepared by mixing 5 tablespoons (one-third cup) of bleach per gallon of water or 4 teaspoons of bleach per quart of water, the CDC wrote in a set of recommendations.
https://www.livescience.com/how-long-coronavirus-last-surfaces.html

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