Male in blue medical gloves uses a stethoscope as he listens closely to a baby
now available, researchers are still trying to understand how immunity to COVID-19 works, and the best ways to build and sustain it.for infants four years old or under dropped to under 1 per 100,000 earlier this year, and have recently inched up slightly to 2 per 100,000 in the middle of September, compared to rates for people over 65 years old, which hit a low of 6 per 100,000 earlier this year and climbed up to 17.6 in September.
However, these factors were abundant in the nasal passages of the babies, suggesting that for them, the battle between the immune system and the virus was occurring primarily in the mucosal tissues of the nose and upper respiratory tract, and not throughout the body in the bloodstream. The mucous membranes of these babies were flooded with interferon in particular, which is a potent immune hormone that can control how much a virus replicates.
The Coronavirus Seems to Spare Most Kids From Illness, but Its Effect on Their Mental Health Is Deepening
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