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What are the emergency warning signs of flu sickness?

In children
Fast breathing or trouble breathing
Bluish skin color
Not drinking enough fluids
Not waking up or not interacting
Being so irritable that the child does not want to be held
Flu-like symptoms improve but then return with fever and worse cough
Fever with a rash

In adults
Difficulty breathing or shortness of breath
Pain or pressure in the chest or abdomen
Sudden dizziness
Confusion
Severe or persistent vomiting
Flu-like symptoms that improve but then return with fever and worse cough

In addition to the signs above, get medical help right away for any infant who has any of these signs:
Being unable to eat
Has trouble breathing
Has no tears when crying
Significantly fewer wet diapers than normal

More information: https://www.cdc.gov/flu/consumer/symptoms.htm