内容摘要：WASHINGTON (AP) — Secretary of State Marco Rubio said Wednesday the U.S. will begin revoking the visas of some Chinese students, including those studying in “critical fields.”

WASHINGTON (AP) — Secretary of State Marco Rubio said Wednesday the U.S. will begin revoking the visas of some Chinese students, including those studying in “critical fields.”

CUAUHTEMOC, Mexico (AP) — In a rickety white Nissan, nurse Sandra Aguirre and herdrive past apple orchards and cornfields stretching to the desert horizon. Aguirre goes door to door with a cooler

. In one of Latin America’s biggest Mennonite communities, she knows many will decline to be vaccinated or even open their doors. But some will ask questions, and a handful might even agree to get shots on the spot.“We’re out here every single day,” said Aguirre, pausing to call out to an empty farm, checking for residents. “To gain trust of the Mennonites – because they’re reserved and closed-off people – you have to meet them where they’re at, show a friendly face.”Aguirre’s work is part of an effort by health authorities across the country to contain

, as cases climb not only here butand Canada. In Mexico, cases have been concentrated in the

— long skeptical of vaccines and

— in the northern border state of Chihuahua.said it will conduct a scientific review of the children’s products by late October with the aim of removing them from the market. Formally withdrawing medical products requires a lengthy rulemaking process that can take years. Instead, the FDA will ask manufacturers to voluntarily pull their products, according to an administration official.

Fluoride tablets and lozenges are sometimes recommended for children and teens at increased risk of tooth decay or cavities because of low fluoride in their local drinking water. Companies also sell drops for babies.said the products pose a risk when swallowed because they may interfere with healthy gut bacteria that are critical to digestion, immunity and other key bodily functions. He also referenced studies showing possible associations between excess fluoride intake and other problems,

The nation’s leading dental group said Tuesday the studies “do not in fact demonstrate any harmful effects” from fluoride at the levels used by dentists.AP’s Lisa Dwyer reports on new plans to phase out the use of fluoride tablets.