Severe episodes of coughing start about 10 to 12 days later.
严重的咳嗽发作开始约10至12天以后。
The H5N1 study goes on to show that it is much easier to evolve this virus into a state where it can be transmitted through the air by coughing or sneezing, which could lead to a severe pandemic.
研究证实很容易对一个国家投放H5N1病毒，而该病毒可以通过咳嗽或打喷嚏在空气传播，这可能会引发严重的流行病。
PCV2 and Mycoplasma co-infection results in severe disease characterized by coughing, labored breathing, lethargy and decreased growth.
PCV2和支原体同时感染会加重病情，表现为咳嗽，呼吸困难，嗜睡和生长缓慢。
PCV2 and Mycoplasma co-infection results in severe disease characterized by coughing, labored breathing, lethargy and decreased growth.
PCV2和支原体同时感染会加重病情，表现为咳嗽，呼吸困难，嗜睡和生长缓慢。
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