1. I hear some people say now-a-days the skin site should not be wiped with spirit swab before giving injections esp. TT. True? If yes,why?

2. I found a case of mumps parotitis in which the patient,a 7-yr old girl, had repeated episodes of  vomiting after taking oral     antibiotics.My senior doctor advised me to give ceftriaxone injections instead.My question asks  is it so important to give      antibiotic prophylaxis in mumps or can we omit the vomit? We know patient compliance will be low if a girl child is to take        injections. Please help