球虫病可由多种球虫生物引起，最常见的病原为等孢球虫。通常该疾病无症状，但也有可能出现腹泻和体重减轻。
Coccidiosis can be caused by a variety of coccidian organisms in dogs, most commonly Isospora. There are usually no symptoms, but diarrhea and weight loss may occur.
随着感染逐渐削弱人体免疫系统，可能会出现其它体征和症状，如淋巴结肿大、体重减轻、发热、腹泻和咳嗽等。
As the infection progressively weakens the person's immune system, the individual can develop other signs and symptoms such as swollen lymph nodes, weight loss, fever, diarrhoea and cough.
它也可能有腹泻，体重减轻和嗜睡。
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