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From there, they sneak past the protective barrier lining the respiratory system and head to the lymph nodes in search of cells that express a particular protein called signaling lymphocytic activation molecule, or SLAM.

When Rafa arrived in October 2023, he was suffering from post-traumatic stress disorder, respiratory problems caused by allergies, nightmares and insomnia, according to a psychological evaluation written by his therapist at the orphanage.

First responders working at close range, often without adequate respiratory protection, were at higher risk of developing adverse health conditions.

His diagnosis came after he caught an upper respiratory infection and his lymph nodes swelled like crazy.

And nearly 1 to 3 of every 1,000 children with measles will die from respiratory and neurologic complications.