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Typically, symptoms of bird flu in cats include a loss of appetite, lethargy and fever, along with neurologic signs, such as repetitively moving around in circles or “circling,” tremors, seizures or blindness.

Without exercise, the human body becomes less efficient at producing energy, which leads to lethargy.

Once the country sees him as president again I suspect that the disconsolate lethargy so many have been feeling will lift and we'll see some energy return to the opposition.

He previously revealed in his memoir he had been "going through a bad moment" after he returned, suffering periods of lethargy and "terrifying panic attacks".

Surveillance of the virus is also complicated by the fact that H5N1 infected cows show only subtle signs of infection — lethargy, decreased milk production, etc.