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Penh of cotton rats infected with A/Wuhan/359/95. The arithmetic means of Penh in infant (open circles) and adult (closed diamonds) cotton rats are shown on days 0 (before infection), 1, 2, 3, 4, 5 and 7 p.i. The SEM is shown for each group and means that were significantly different from Penh measured on day 0 (t test within in each age group, p < 0.05) are indicated with an * for adults and ❊ for infants.
