There is a study reconstructing how Coronavirus spread in Austria (link to German summary article on Spiegel Online). The researchers found not a single infection cluster in schools or Kindergarten, and not a single case where a child was the source of infection in a family. The conclusions of the study include (short version of the points listed in the article I am linking to):
people infect others before (they realize) they have symptoms,
infection takes place within few days after infection (3 to 5 days),
transmission happens when several people are at the same place for a longer timespan (about 15 minutes),
for most clusters, point expositions were found: one person is at the beginning of the chain, and there are more infections when that person has contact to other persons for a longer timespan (probably they mean the 15 minutes from the previous point)
quarantine measures and barriers work,
there are currently no transmission chains that would give evidence to transmission via public transport or visiting a shop.
There is a study reconstructing how Coronavirus spread in Austria (link to German summary article on Spiegel Online). The researchers found not a single infection cluster in schools or Kindergarten, and not a single case where a child was the source of infection in a family. The conclusions of the study include (short version of the points listed in the article I am linking to):
people infect others before (they realize) they have symptoms,
infection takes place within few days after infection (3 to 5 days),
transmission happens when several people are at the same place for a longer timespan (about 15 minutes),
for most clusters, point expositions were found: one person is at the beginning of the chain, and there are more infections when that person has contact to other persons for a longer timespan (probably they mean the 15 minutes from the previous point)
quarantine measures and barriers work,
there are currently no transmission chains that would give evidence to transmission via public transport or visiting a shop.