California: An unvaccinated teacher infected 26 people

An unvaccinated California elementary school teacher was the source from which Covid-19 was transmitted to at least 26 people, 18 of whom were students, according to a US study released today.

This case demonstrates the importance of teacher vaccination, especially when their students are young and unvaccinated, according to the Centers for Disease Control and Prevention (CDC), the most important federal health service in the United States.

It also shows that measures are needed, such as the proper use of the mask, in the midst of the outbreak of new cases related to the Delta variant of the new coronavirus.