Cat flu

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Cat flu is the common name for a feline upper respiratory disease, which can be caused by one or more possible pathogens:

1. Feline herpes virus, causing feline viral rhinotracheitis (cat common cold; this is the disease most associated with the "cat flu" misnomer),
2. Feline calicivirus,
3. Bordetella bronchiseptica (cat kennel cough), or
4. Chlamydia felis (chlamydia).