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Pat Sullivan / AP

The first known instance of local mosquito transmission of the Zika virus in the continental U.S. this year was reported late today by health officials in the state of Texas. The Zika transmission likely occurred sometime in the past few months in South Texas, they said.

The Zika infection occurred in a Hidalgo County resident who had not traveled outside the area, and also did not have any of the other risk factors for Zika infection identified by public health officials monitoring the spread of Zika in South, Central and now North America.

For this reason, the Texas Department of State Health Services said that the infection was "probably transmitted" by a mosquito bite in South Texas. Further lab tests showed that the Hidalgo County resident was no longer at risk of spreading the virus via mosquito populations.Texas health officials began increased Zika testing of pregnant women and people with Zika-like symptoms in six South Texas counties this past spring. (There were six locally-transmitted Zika cases in Brownsville last November and December.) The local transmission case announced today was a direct result of that increased testing regime.

What's next: Texas officials said that there is no evidence of ongoing Zika transmission in the state, but the news today will almost certainly lead to even more human and mosquito surveillance testing in the southern part of the state. Local health officials had already been going door to door in South Texas counties to share information about Zika with pregnant women and people with symptoms to make sure they were tested.

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Trump impeachment trial to start week of Feb. 8, Schumer says

Senate Majority Leader Chuck Schumer. Photo: The Washington Post via Getty

The Senate will begin former President Trump's impeachment trial the week of Feb. 8, Majority Leader Chuck Schumer announced Friday on the Senate floor.

The state of play: Schumer announced the schedule after reaching an agreement with Republicans. The House will transmit the article of impeachment against the former president late Monday.

3 hours ago - Health

CDC extends interval between COVID vaccine doses for exceptional cases

Photo: Joseph Prezioso/AFP via Getty

Patients can space out the two doses of the coronavirus vaccine by up to six weeks if it’s "not feasible" to follow the shorter recommended window, according to updated guidance from the Centers for Disease and Control and Prevention.

Driving the news: With the prospect of vaccine shortages and a low likelihood that supply will expand before April, the latest changes could provide a path to vaccinate more Americans — a top priority for President Biden.