From the CDC back on 15 July

“Coronaviruses are thought to be spread most often by respiratory droplets. Although the virus can survive for a short period on some surfaces, it is unlikely to be spread from domestic or international mail, products or packaging.”

This isn’t about USPS mail or Amazon or Walmart packages, but the principle should apply. The school system has a CDC approved disinfectant which will kill all severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) within ten minutes, but most infections won’t come from touching what others touched, rather from breathing droplets others have exhaled.

Clean the surfaces all you want, the virus will definitely be back as soon as the first infected person without a mask walks into the room.

Surely you have seen things which didn’t make sense but were true.
It happened all the time back in school.
It usually meant you knew too little, not too much, and expected what you wouldn’t get. For example, many expected this disease to act like other diseases even though those don’t act like each other.

They are finding out new things all the time. Would you want them to not share the information until they know everything? That could be a long while.

“While viral RNA shedding declines with resolution of symptoms, it may continue for days to weeks. However, the detection of RNA during convalescence does not necessarily indicate the presence of viable infectious virus.”
https://www.cdc.gov/coronavirus/2019-ncov/hcp/clinical-guidance-management-patients.html

To get an idea of how many weeks they mean, look at:

“…in another study of 56 patients with mild to moderate illness (none required intensive care), the median duration of viral RNA shedding from naso- or oropharyngeal specimens was 24 days, and the longest was 42 days”
[This means they were putting out the virus up to 42 days from infection.]
and
“Isolation of infectious virus from upper respiratory specimens more than ten days after mild illness onset has only rarely been documented.”
https://www.uptodate.com/contents/coronavirus-disease-2019-covid-19-epidemiology-virology-and-prevention

Forty days is less than their 42 days, but they are not sure how long the virus might still be dangerous; it varies.
Please pay close attention to the word “rarely,” which means it has happened but not that often.
How lucky do you feel with others’ lives? Few — but SOME — would die or even get sick after 10 days.

David for knowledge shared