Canadian health officials have confirmed bird flu in a British Columbia teen

The CDC said Thursday it is updating its recommendations for testing, treatment and protection for workers who may be exposed animals infected with bird flu.

The number of bird flu cases has risen to 31 in the U.S. but there is no evidence of person-to-person transmission, the CDC said in a press conference on Thursday.

There are currently no recommendations for anyone to be vaccinated against bird flu and federal health officials note this is being done out of "an abundance of caution."

This brings the national total of human bird flu cases to 14 so far this year.

An adult with underlying medical conditions was hospitalized on Aug. 22 and has since recovered, the Missouri health department said.

The World Health Organization launched an initiative on Monday to help accelerate the development of a human bird flu vaccine using mRNA technology.

What to know about the avian flu and the risk to humans.

Finland is offering farmworkers bird flu shots. But, even with a stockpile of bird flu vaccinations, the U.S. government is not offering them to those at high risk.

The CDC confirmed the fourth human case of bird flu linked to the current dairy cow outbreak on Wednesday in a dairy worker in Colorado.

Officials say results from a new study confirm pasteurization is effective in inactivating the virus.

ABC News’ Trevor Ault shares the latest on the growing concerns over bird flu in the country.

The WHO confirmed Friday that the patient in a fatal bird flu case in Mexico died due to his other severe medical conditions.

The World Health Organization confirmed on Wednesday the first fatal case of a subtype of bird flu in Mexico.

Officials in Mexico say a 59-year-old man, who had underlying medical conditions and had been infected with the H5N2 strain of bird flu strain, died in the hospital.

As a third human case of bird flu is confirmed in Michigan, scientists are ramping up vaccine testing in animals to prevent the spread to humans.

The USDA announces it will spend more than $800 million to protect livestock after a third farm worker was diagnosed with the virus.

State health authorities confirmed on Thursday that a third human case of H5 bird flu connected to the ongoing U.S. outbreak in cattle has been found in a farmworker in Michigan.

A second human case of bird flu has been confirmed in Michigan, bringing the total number of cases in the U.S. this year to three, health official said.

After inactive bird flu fragments were found in milk samples, here's everything you need to know about the recent bird flu outbreak.

In an alert on Friday, the CDC said it is preparing for the "possibility of increased risk to human health" from bird flu.

Dairy farmers and veterinarians in northern Texas noticed illness among cattle and the government pushed farms and farmworkers for more information.

The second human case of bird flu associated with the current outbreak has been confirmed in Michigan, health officials said Wednesday.

The FDA, USDA and CDC shared the latest updates on avian flu testing in retail dairy products.