They focus on type A, which tends to cause more severe disease and pandemics.

科学家们把重点集中在了A型流感上, 因为它往往会造成更严重的疾病和流行病.

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Background. Acute pyelonephritis is a potentially severe disease for which there are few population - based studies.

急性肾盂肾炎是较少几项以人口基础研究的潜在严重性疾病之一.

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