Experts say it’s too early to know if we’ll need booster shots for the COVID-19 vaccines. Jacob Lund/Getty Images The CEOs of some pharmaceutical companies say COVID-19 vaccination booster shots may be needed as early as this fall to bolster immunity against the disease. Experts say it’s too early to tell if and when those booster shots will be needed. Booster shots are not uncommon. They’re used for the Tdap (tetanus, diphtheria, pertussis) vaccine, among others. The vaccines being used in the United States and other parts of the world…