3 ms·

< https://www.cdc.gov/mmwr/volumes/71/wr/mm7102e1.htm https://www.cdc.gov/mmwr/volumes/71/wr/mm7102e1.htm The study you cite specifically excludes those under

< https://www.cdc.gov/mmwr/volumes/71/wr/mm7102e1.htm https://www.cdc.gov/mmwr/volumes/71/wr/mm7102e1.htm The study you cite specifically excludes those under 5.