New bird flu cases hit New York City zoos

(1:51)

Flu cases on the rise across the U.S. as doctors urge people to get vaccinated

(48)

Spike in flu cases forces school closures across the country

(1:43)

What you need to know about rising flu cases and bird flu concerns

(3:13)

Flu cases skyrocket in NYC, across the U.S.

(1:56)

Second surge of flu cases leads to school closures

(1:33)

Spike in flu cases in Illinois is a particular concern for parents

(2:23)

Flu cases at 'high levels' in 32 US states

(1:9)

Bird flu concerns for New York

(2:13)

Flu cases surge in US

(4:10)

Flu cases at 'high levels' across 32 states, schools close to recover

(1:7)

Flu cases surge in Illinois amid intense respiratory virus season

(1:45)

Flu cases on the rise in North Texas

(2:58)

Flu cases spike in New Jersey, doctors call it worst flu season in years

(2:6)

Cook Children's reports increase in flu cases compared to last year

(1:13)

At least 7 cases of bird flu detected in New York

(2:37)

Flu cases at \

(1:10)

Flu cases and deaths continue to rise in Arkansas

(2:21)

Flu cases peak for a second time this season as school districts continue to close

(2:3)

Flu cases reach season high in Fayette County

(36)