由于流感爆发已大肆流行，疫苗供应开始消耗殆尽。
Vaccine supplies started to run dry as the flu outbreak reached epidemic proportions.
然而，在以白杨等树为主的林分，最初的舞毒蛾爆发很快就被病毒流行病所抑制。
In stands dominated by trees such as aspen, however, incipient gypsy moth outbreaks are quickly suppressed by viral epidemics.
2009年6月11日，墨西哥首次爆发的猪流感被宣布为全球流行病。
The outbreak of swine flu that was first deteccted in Mexico was declared a global epidemic on June 11, 2009.
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