year, or maybe even sooner. reporter: critics worry a vaccine might be rushed, but the white house says the timing has nothing to do with the election. earlier, dr. anthony fauci said he thinks that a safe vaccine will be identified by the end of the year. i believe that by the time we get to the end of this calendar year, that we will feel comfortable that we do have a safe and effective vaccine. reporter: the virus has killed 185,000 americans and is now triggering new outbreaks. colleges are quarantining thousands of students across the country. i believe i m on day six of quarantine. reporter: some schools like north carolina state and james madison are sending students home. we did feel a little blindsided due to the fact that we didn t know. reporter: but dr. fauci warns, it s the wrong approach. that s the worst thing you can do. keep them up at the university in a place that s sequestered enough from the other students, but don t have them go home, because they