Dr. Fauci, Director of the National Institute of Allergy and Infectious Diseases has been hopeful for a coronavirus vaccine.
Now, Dr. Fauci says he would "settle" for a Covid-19 vaccine that's 70% to 75% effective.
Fauci cautioned however that this incomplete protection won't be enough to quell the outbreak completely.
According to CNN, three coronavirus vaccines are expected to be studied in large-scale clinical trials in the next three months.
The U.S. has reported over 2.6 million cases of coronavirus, with a death toll of 128,437 people.