4 ms·
50% effective vaccine could lower R0 of 2.5 to 1.25 (2.5 * 50% = 1.25). That's R0 > 1, so it can't stop transmission.
by sanxiyn 6y ago
50% effective vaccine could lower R0 of 2.5 to 1.25 (2.5 * 50% = 1.25). That's R0 > 1, so it can't stop transmission.