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。

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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。

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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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The main symptoms are severe coughing fits which, in babies and children, are accompanied by the characteristic "whoop" sound as the child gasps for breath after coughing.

BBC: Whooping cough cases increase in England and Wales

The family brought Piper to the Children's Hospital at the University of Oklahoma Medical Center on Aug. 22 because she was having severe coughing fits at home and then her left leg and entire right side went limp.

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Coronaviruses are a large family of viruses ranging from the common cold to the Sars (severe acute respiratory syndrome) virus, spread through droplets of body fluids produced by sneezing and coughing.

BBC: Second UK case of 'Sars-like' coronavirus identified