Limited data are available regarding the seroprevalence of measles, mumps, rubella, and varicella (MMRV) among emergency medical technicians (EMTs) in Japan. The present study aimed to review a project to evaluate adequate immunity against MMRV for the requirement of additional vaccination among EMTs in accordance with the Japanese Society for Infection Prevention and Control guidelines. A retrospective observational study was conducted as part of a vaccination program for EMTs. Each participant was evaluated for medical history, vaccination history, and serology using the criteria established by the Japanese Society of Infection Prevention and Control. In total, 85 EMTs (median age, 31 years; male, 92.9%) were included. Among the included EMTs, 32 (37.6%), 54 (63.5%), 46 (54.1%), and 84 (98.9%) were seropositive for measles, rubella, mumps, and varicella, respectively, whereas 1 (1.2%), 6 (7.1%), 5 (5.9%), and 0 (0%) were seronegative. Furthermore, 48 (56.5%), 27 (31.8%), 45 (52.9%), and 8 (9.4%) EMTs received an additional dose of vaccines for measles, rubella, mumps, and varicella, respectively. The present study suggests that EMTs are not fully immune to MMRV, which highlights the need for confirming the immune status and additional vaccination requirement to prevent occupational infections.

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BACKGROUND: It is unclear whether recommended doses of intramuscular polyvalent immune globulin are optimal for both effectiveness and efficiency of disease prevention when administered post-exposure to measles and rubella.
METHODS: The peak concentration and decay of disease-specific antibodies after intramuscular dosing of polyvalent immune globulin in adults were modeled using published pharmacokinetic parameters and product disease-specific antibody concentrations. Models simulated dosing according to current Australian guidelines, then adjusted the dose in clinically relevant increments to estimate the optimal dose of disease-specific immunoglobulins for post-exposure prophylaxis of nonimmune individuals against measles and rubella. Optimal dosing assumed a target serum concentration of disease-specific antibodies of the correlate of protection plus a 10% margin of error at an incubation period.
RESULTS: Current Australian guidelines appeared to underdose a measles-naïve subpopulation. The optimal dose of measles-specific antibodies was 17.5 IU/kg assuming 75% bioavailability and 25.5 IU/kg assuming 50% bioavailability. Current Australian guidelines recommend 520 IU/kg rubella antibodies for an 80-kg individual. This model suggests that 13 IU/kg is more than sufficient.
CONCLUSIONS: The recommended dose of intramuscular polyvalent immune globulin should be increased following measles exposure and decreased following rubella exposure for recommended subgroups. These models may be adapted for use internationally.

OBJECTIVE: To propose guidelines for clinical practice regarding pertussis, influenza, varicella and rubella vaccination in the early post-partum.
METHODS: Bibliographic searches were performed with PubMed and Cochrane databases, and within national guidelines and their references.
RESULTS: Women that have not got vaccinated in the past 10 years should receive a dose of diphtheria-tetanus-acellular pertussis-poliomyelitis vaccine in the early post-partum, and the family and friends should be included in the cocooning strategy (professional consensus). During seasonal influenza epidemic, influenza vaccine should be offered to women, who were not vaccinated during pregnancy, and delivered a vulnerable neonate (professional consensus). For all other women, the vaccination can be discussed on a case-by-case basis (professional consensus). In order to prevent congenital or neonatal varicella in a subsequent pregnancy, scientific data are weak to suggest a systematic screening and vaccination against varicella in women with no history or uncertain status about varicella, excepted in women coming from sub-Saharan Africa, East and Central Europe, more likely to have a negative serology for varicella (professional consensus). In order to prevent severe varicella in adulthood, the vaccination should be discussed with potentially seronegative women as recommended by the French High Council for Public Health (professional consensus). Rubella vaccine is recommended in the early post-partum with women with negative serology during pregnancy with a dose of measles-mumps-rubella vaccine (professional consensus). A new pregnancy should be avoided in the month following rubella and varicella vaccination, but contraception is not obligatory (professional consensus). Breastfeeding, recent rhesus immunoglobulin injection and blood transfusion do not prevent to perform vaccination in the early post-partum (professional consensus).

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This communication is the third in a four-part series on nosocomial viral infections from the Strong Memorial Hospital. This third article discusses guidelines for prevention and control of exanthematous viruses, gastroenteritis, viruses, adenoviruses and the picornaviruses other than rhinoviruses. Several uncommonly seen viruses, such as the virus of Creutzfeldt-Jakob disease and Marburg, Ebola, and Lassa fever viruses, also are reviewed briefly.