Measles, mumps, and rubella revaccination in children after completion of chemotherapy and hematopoietic stem cell transplantation: a single-center prospective efficacy and safety analysis.

BACKGROUND: Chemotherapy and hematopoietic stem cell transplantation (HSCT) can damage the immune system, and may result in a loss of protection from infectious diseases. This study aimed to evaluate the impact of these treatments on the decrease in antibody titers of the measles, mumps, and rubella (MMR) vaccine and seroconversion post-revaccination of MMR. METHODS: After completion of treatment for primary diseases, participants received an MMR revaccination. Antibody titers for MMR before revaccination were analyzed for all 110 children. After revaccination, 68 participants received a follow-up evaluation of  antibody titer and adverse reaction. RESULTS: Multivariable analysis showed that therapeutic schedules were the only factor correlated with lack of antibody titers for measles after completing treatment (P = 0.008), while for mumps and rubella, no statistically significant difference was observed. Importantly, our study clearly demonstrated positive seroconversion rates for measles (97.5%), mumps (81.0%), and rubella (93.2%), with antibody levels rising across the board and peaking at around 6 months following revaccination. However, 6 months after revaccination, a downtrend of antibody titer levels was observed, which is comparatively earlier than the waning immunity observed in healthy children. Furthermore, we found MMR revaccination to be safe, with only a single adverse reaction (local pain at the injection site) reported. CONCLUSIONS: MMR revaccination is immunogenic for the population. We suggest periodic monitoring of antibody titers, in addition to a booster vaccination, although the optimal timing of booster vaccination remains to be investigated further.

Decreased humoral immunity to mumps in young adults immunized with MMR vaccine in childhood.

In the past decade, multiple mumps outbreaks have occurred in the United States, primarily in close-contact, high-density settings such as colleges, with a high attack rate among young adults, many of whom had the recommended 2 doses of mumps-measles-rubella (MMR) vaccine. Waning humoral immunity and the circulation of divergent wild-type mumps strains have been proposed as contributing factors to mumps resurgence. Blood samples from 71 healthy 18- to 23-year-old college students living in a non-outbreak area were assayed for antibodies and memory B cells (MBCs) to mumps, measles, and rubella. Seroprevalence rates of mumps, measles, and rubella determined by IgG enzyme-linked immunosorbent assay (ELISA) were 93, 93, and 100%, respectively. The index standard ratio indicated that the concentration of IgG was significantly lower for mumps than rubella. High IgG avidity to mumps Enders strain was detected in sera of 59/71 participants who had sufficient IgG levels. The frequency of circulating mumps-specific MBCs was 5 to 10 times lower than measles and rubella, and 10% of the participants had no detectable MBCs to mumps. Geometric mean neutralizing antibody titers (GMTs) by plaque reduction neutralization to the predominant circulating wild-type mumps strain (genotype G) were 6-fold lower than the GMTs against the Jeryl Lynn vaccine strain (genotype A). The majority of the participants (80%) received their second MMR vaccine ≥10 years prior to study participation. Additional efforts are needed to fully characterize B and T cell immune responses to mumps vaccine and to develop strategies to improve the quality and durability of vaccine-induced immunity.

Pesquisa inmuno-epidemiológica en niños con meningoencefalitis vírica vacunados contra la parotiditis, rubeola y sarampión / Immuno-epidemiological inquiry in children suffering viral meningoncephalitis vaccinate against mumps, rubella and measles

En las meningoencefalitis de etiología viral se encuentran implicados los paramixovirus (virus de la parotiditis, sarampión y rubeola). Las vacunas combinadas trivalentes han sido utilizadas durante años en muchos países. El objetivo del trabajo es determinar la respuesta poliespecífica de anticuerpos de tipo IgG anti parotiditis, rubeola y sarampión en pacientes pediátricos con meningoencefalitis víricas agudas. Se realizó un estudio retrospectivo en el año 2018 en muestras de pacientes pediátricos con meningoencefalitis viral aguda vacunados con la triple viral, donde se utilizó el índice de anticuerpos específicos anti-parotiditis, anti-rubeola y anti-sarampión para identificar el estado de respuesta inmunológica contra dichos virus en la muestra estudiada, procedentes de la serorraquioteca de LABCEL. Las determinaciones se hicieron por ELISA. Todos los pacientes presentaron respuesta poliespecífica intratecal, disminución significativa del índice de anticuerpos IgG anti-parotiditis con respecto a la edad y al tiempo de respuesta. Se evidencia un acortamiento del tiempo de respuesta de los anticuerpos de tipo IgG específicos anti-parotiditis en relación a la edad de vacunación(AU)

Paramixovirus like mumps, rubella and measles are involved in some viral meningoencephalitis. Triple combined vaccines have been employed for several years in many countries. The aim of this work is to determine the IgG anti mumps, rubella and measles polyspecific response in pediatric patients with acute viral meningoencephalitis. A 2018 retrospective study in pediatric patients with acute viral meningoencephalitis previously vaccinated with the triple viral vaccine MMR was performed to identify the immune response status against mumps, rubella and measles in samples from LABCEL serum and cerebrospinal fluid collection. Quantification of IgG specific antibody was performed by ELISA. Intrathecal polyspecific response was present in all patients. A significant decrement of anti IgG mumps specific antibody index was observed according to age and response time. A shortage of the response time of IgG mumps specific antibodies according to the age of vaccination was demonstrated(AU)

Influences on immunization rates: Vaccination coverage of mumps, measles, rubella and varicella before and after the STIKO intervention 2011 - A retrospective study.

BACKGROUND: In September 2011, the German Standing Committee on Vaccinations (STIKO) changed their recommendation regarding the mumps-measles-rubella-varicella vaccination (MMRV). We compared the immunization rates against MMRV in Germany before and after the STIKO intervention. METHODS: We recorded the immunization status of children born between 09/2008 and 08/2012 in 35 selected doctor's surgeries in Germany. RESULTS: After the STIKO intervention, the ratio of the combined MMRV vaccine as the first dose immunization was reduced to approximately 25% of the initial value. A slight increase in the number of children not sufficiently vaccinated against varicella (1.2%) was observed, but the immunization rates against measles, mumps, rubella and varicella did not significantly decrease. CONCLUSIONS: The STIKO intervention led to a significant change in physicians' vaccination procedures. The separate administration MMR+V vaccination may be a helpful option to improve the immunization rates in general.

Survival Analysis for Predictive Factors of Delay Vaccination in Iranian Children.

BACKGROUND: Today, beside immunization coverage the age appropriate vaccination is another helpful index in public health. Evidences have shown that high immunization coverage rates do not necessarily imply age-appropriate vaccination status. The current study aimed to show the predictive factors of delayed vaccination by survival models. METHODS: A historical cohort study conducted on 3610 children aged between 24 and 47 months who was living in the suburbs of five big cities of Iran. Time of delay in vaccination of first dose of mumps-measles-rubella (MMR) was calculated from date of vaccination minus age appropriate time according to vaccine card. Kaplan-Maier and Log rank tests were used for comparison the median of delay time. For controlling of confounding variables, multivariate cox model was used and hazard ratio with 95% confidence interval (95%) was reported. RESULTS: The mean ± standard deviation and median interquartile range of delay time was 38.34 ± 73.1 and 16 (11-31) days in delayed group. The Log rank test showed that city of living, nationality, parents' education, and birth order are related with prolonged delay time in MMR vaccination (P < 0.05). Nevertheless, child sex, prior living place (rural or city) and parent's job are not related with delay time of vaccination (P > 0.05). Cox regression showed that city of living, mother education, and nationality are the most predictive factors of delay time duration in MMR vaccination. CONCLUSIONS: Delay time duration of vaccination increased by faring from capital to the east south. Moreover, concentration of foreign immigrants in big cities and low level of mother education are the most predictors of delayed vaccination. Educational intervention should focus on immigrants and mothers with low education level.

Efficacy of intralesional injection of mumps-measles-rubella vaccine in patients with wart.

BACKGROUND: In the previous studies, it has been shown that mumps-measles-rubella (MMR) vaccine resulted in regression of warts via immunomodulatory effect and induction of immune system. Due to the high prevalence of warts in various populations, we evaluated the efficacy of MMR vaccine injection in the treatment of cutaneous warts. MATERIALS AND METHODS: This double-blind randomized controlled clinical trial was conducted in Hazrat-e-Rasoul Hospital in Tehran in 2011-2012 on 24 patients with warts who were allocated to two groups including MMR group and normal saline group. MMR vaccine was injected intralesionally in the MMR group, whereas normal saline was injected into the lesions in the second group. These injections were repeated every 2 weeks intervals for maximum 3 injections. All patients were followed up every 15-day interval up to 45 days and then up to 6 months regarding relapses and finally, side effects, probable relapse, and therapeutic outcomes were evaluated and compared. RESULTS: At the end of follow-up period, therapeutic outcomes in the MMR group included no cure in 2 cases, relative cure in 4 cases, and complete cure in 18 cases. In normal saline group, these rates included no cure in seven cases, relative cure in nine cases, and complete cure in six cases (P < 0.001). No significant complication occurred in the two groups. CONCLUSION: MMR vaccine may result in desirable therapeutic response. The hypothesis that is considered here is that MMR vaccine, via induction of cellular and humoral immune system, accelerates the destruction of virus and infected host cells.