Mae brechlynnau’n dysgu eich system imiwnedd sut i’ch diogelu chi rhag clefydau. Mae llawer yn fwy diogel i’ch system imiwnedd ddysgu hyn drwy frechlyn na thrwy ddal clefyd a cheisio ei drin.
Vaccines teach your immune system how to protect you from diseases. It's much safer for your immune system to learn this through vaccination than by catching diseases and attempting to treat them.