@se7en @moonman Except for elderly or immune-compromised people, flu vaccine is made with weakened but still living virus. That's why people sometimes get "flu-like symptoms" after a shot. Their bodies are literally fighting off attacks by influenza viruses.

They pick currently active strains and strains that they believe will be active during that year's season. There was one recent year where the most active strain was not in that year's vaccine, but that does not happen often.

I can't speak to the toxicity angle, but it is well established that keeping current with flu shots helps to reduce the number of people who die from flu.