. >> reporter: rachel devi has seen firsthand how the respiratory infection rsv has impacted her family. >> they are still just staying to themselves. they wanted me to come over, her birthday was yesterday and we had to just stay home and do some face time celebration. >> reporter: santa clara county is seeing unusually high levels of the flu and rsv, prompting healthcare officials to send out this warning. >> do not send your child to daycare or school and please do not go to work. this is the easiest way to spread the infection to other people and increase the burden on our healthcare systems. >> reporter: what has healthcare providers concerned is how early the winter viruses are hitting this year. the reason why? we asked dr. david kornfield the stanford children's health and he believes it is because of the pandemic. kids that were isolated and masks did not catch it until now. >> we are seeing rsv not just in kids who are a year old or two years old but in kids less than three years old all at once and it is the case that the first infection tends to be the most severe. >> report