MOS Codes: 0300,0311,0365,0369,0370,5803,5811,5812,5814,5821,8151,8152,8154,8156,113X,11A,11B,11C,11Z,180A,18A 18B,311A,31A,31B,31D,31K,31PX,31Z,3P0X1,649X,715X,749X,GM,MA,ME,MLES,MST,OAF10,OAF12,OAP10,OAP14 OAR10,OAR13,OS,OSS,SO. According to the Centers for Disease Control and Prevention, healthcare workers are considered to be at significant risk for acquiring or transmitting hepatitis B, measles, mumps, rubella, varicella (chicken pox), tetanus, diphtheria, pertussis (whooping cough), and influenza.