Causes of a temporary rapid pulse include anxiety, fever, stress and exercise. Tachycardia causes a prolonged, sustained elevated heart rate, and it may cause your heart rate to increase to 400 beats per minute, notes the Heart Rhythm Society.
New flu vaccines are released every year to keep up with rapidly adapting flu viruses. Because flu viruses evolve so quickly, last year's vaccine may not protect you from this year's viruses. After vaccination, your immune system produces antibodies that will protect you from the vaccine viruses.
This myth really caught on over the years. Flu shots are made with dead viruses or without any viruses at all.Flu shots are made with dead viruses or pieces (proteins) from the flu virus. You canât catch the flu from getting one. Your arm might hurt after the shot. You might have aches or a low fever. But you'd feel a lot worse if you caught the flu.