A study by Mela and Whitsworth in the American Journal of Infection Control found that fist bumps transferred one-quarter as much bacteria as a moderate handshake and even less compared to a strong handshake. Fist bumps are better because of lower contact times and lower contact area.
For those at RSA here in San Francisco, the Mayor declares a state of emergency to enable the city and county to prepare, https://www.sfchronicle.com/bayarea/article/SF-mayor-London-Breed-declares-state-of-emergency-15083811.php. Time to prepare. This is should be enough to protect you.