22 April - 28 April You are vulnerable to catching cold, and must take special care to avoid contamination. Be aware of what you touch, and wash your hands often. Bacteria are spread largely via the hands, and you should be careful about putting your unwashed hands near your mouth. Additionally, pay attention to who is sick at work and don't use a telephone that someone who is infected with a cold has just used. Knowledge of transmission is a great defense against infection.