Next Generation of Covid-19 Vaccines Could Be a Pill or Spray

Next Generation of Covid-19 Vaccines Could Be a Pill or Spray

Next Generation of Covid-19 Vaccines Could Be a Pill or Spray

At Altimnune’s lab in Gaithersburg, Md., scientists are developing a new Covid-19 vaccine.

At Altimnune’s lab in Gaithersburg, Md., scientists are developing a new Covid-19 vaccine.

Photo: Ting Shen for The Wall Street Journal