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No active lesion in the lung of patient A on admission on day 20 of the disease (a1) is seen, but in the same patient the upper right lung interstitial infiltration can be observed six days after admission (a2). In patient B, interstitial infiltration is seen on admission in the left lower lobe on day 15 of the disease (b1) and remains for five days after admission (b2). Source: Images adapted from Hsih et al.[51]
