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AP
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TIJUANA, Mexico — Two years and 21 days after the first asylum seeker was walked back from San Diego to Tijuana under the Trump administration’s “Remain in Mexico” program, a small group of asylum seekers was escorted in the other direction to wait out immigration court cases in the United States.

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As the coronavirus pandemic broke out across the country, health care providers and scientists relied on the standard method for detecting respiratory viruses: sticking a long swab deep into the nose to get a sample. The obstacles to implementing such testing on a mass scale quickly became clear.