The U.S. has taken the unprecedented step of dropping the number of vaccines it recommends for every child — leaving other immunizations, such as flu shots, open to families to choose but without clear guidance. Officials say the overhaul to the federal vaccine schedule, announced Monday, won't result in any families losing access or insurance coverage for vaccines, but medical experts are slamming the move, saying it could lead to reduced uptake of important vaccinations and increase disease.

A recent study of schoolchildren finds that the youngest students harbor the most germs. Researchers looked at nasal swabs and symptom reports of more than 800 students and staff in Kansas City, Missouri. Kids in pre-kindergarten and elementary school had the highest rates of virus detection compared with older students and staff. The pre-K kids, ages 3 to 5, had the highest rates of actual illness, too. Young children can have up to 10 respiratory viruses as their immune systems are introduced to different infections for the first time. Those viruses include colds, flu and more.

More than 420 anti-science bills attacking longstanding public health protections — vaccines, milk safety and fluoride — have been introduced in statehouses across the U.S. this year. It's part of an organized, politically savvy campaign to enshrine a conspiracy theory-driven agenda into law. An Associated Press investigation found that the wave of legislation has cropped up in most states, pushed by people with close ties to Health and Human Services Secretary Robert F. Kennedy Jr. Around 30 have been enacted or adopted. The effort would strip away protections that have been built over a century and are integral to American lives and society.

Health Secretary Robert F. Kennedy Jr.'s new vaccine advisers added confusion Friday to this fall's COVID-19 vaccinations. For the first time since the shots were developed, the group has declined to recommend their use — instead leaving the choice up to those who want them. The Food and Drug Administration recently put new restrictions on this year's shots from Pfizer, Moderna, and Novavax, reserving them for people over 65 or younger ones at higher risk. The Centers for Disease Control and Prevention advisers declined to recommend that those people seek a shot but narrowly avoided urging states to require a prescrption for those who want one.

COVID-19 activity is rising in much of the country. Data shows overall respiratory virus spread is very low in the U.S. But COVID-19 is rising in most states, with more people of all ages going to emergency rooms because of it. The stratus variant is most common. It can cause a "razor blade" sore throat and is considered a "variant under monitoring" by the World Health Organization, but it is only marginally better at evading people's immune systems. Flu and RSV activity remain very low. Doctors say hot summer weather can drive people indoors where respiratory viruses like to spread.

COVID-19 activity is rising in much of the country. Data released Friday by federal health officials shows overall respiratory virus spread is low. But COVID-19 is rising in many states in the mid-Atlantic, the South, the southeast and on the West Coast. More people of all ages are going to emergency rooms because of COVID-19. Flu and RSV activity remain very low. Doctors say hot summer weather can drive people indoors where respiratory viruses like to spread.

Measles cases in the U.S. are at their highest in more than three decades. The U.S. Centers for Disease Control and Prevention says the U.S. has 1,288 cases since the beginning of the year. That's higher than 2019, when there 1,274 cases driven by 22 outbreaks over 12 months. Eighteen states have seen outbreaks this year. Experts fear the U.S. may lose its status as having eliminated measles. There are also large outbreaks of the vaccine-preventable disease in Mexico and Canada.