In a follow-up on the canine influenza outbreak in Los Angeles County, Veterinary Public Health now reports 1284 confirmed and probable cases of canine influenza virus (CIV) H3N2 in dogs in LA County from July to December 20, 2021.
The death toll has risen to 13 dogs linked to this outbreak.
Of the cases reported, most were associated with attending boarding kennels or dog daycare settings. There are a number of cases that have never visited a boarding or daycare facility, but were exposed while on walks in their neighborhood, at dog parks, groomers, or at veterinary clinics.
CIV H3N2 usually causes mild to moderate disease in dogs and on rare occasions can also infect cats. This strain of canine influenza was first found in the US in 2015 when it was detected in Chicago and spread to other parts of the country.
Infected dogs are contagious to other dogs 2 days before the start of clinical signs, and for at least 21 days or more afterward, even after they appear healthy.
Transmission of influenza usually occurs through contact with infected respiratory secretions (e.g. coughing, sneezing) as well as from contamination of the environment (e.g. bedding, floors, bowls, collars, leashes). To date, there is no evidence that humans can become sick with canine influenza H3N2.