Science Library Category:

Vaccination Failure

Published: 2019
SYNOPSIS

Waning levels of measles antibodies with increasing time post-vaccination suggests that measles susceptibility is potentially increasing in Korea.

TITLE

An increasing, potentially measles-susceptible population over time after vaccination in Korea

CITATION

Kang, H. J., et al. Vaccine, 35 (2017) 4126–4132.

SUMMARY

In Korea, measles occurs mainly in infants <12 months of age, who are unvaccinated. In
addition, vaccine populations, including adolescents and young adults, can become infected through importation. Thus, the question arises whether the current level of herd immunity in Korea is now insufficient for protecting against measles infection.

View Abstract

TAGS
Published: 2019
SYNOPSIS

About 2–10% of healthy individuals fail to mount antibody levels to routine vaccines.

TITLE

Primary vaccine failure to routine vaccines: Why and what to do?

CITATION

Ursula Wiedermann,* Erika Garner-Spitzer, and Angelika Wagner. Human Vaccines Immunotherapeudics, 2016 Jan; 12(1): 239–243.

SUMMARY

There are 2 major factors responsible for vaccine failures, the first is vaccine-related such as failures in vaccine attenuation, vaccination regimes or administration. The other is host-related, of which host genetics, immune status, age, health or nutritional status can be associated with primary or secondary vaccine failures. The first describes the inability to respond to primary vaccination, the latter is characterized by a loss of protection after initial effectiveness. Our studies concentrate on the evaluation of immunological characteristics responsible for primary vaccine failures in different (risk) populations for which the underlying mechanisms are currently unknown. Here we summarise current knowledge and findings from our studies.

About 2–10% of healthy individuals fail to mount antibody levels to routine vaccines. Comparing the immune responses to different vaccines in non-responder and high-responder vaccinees revealed that hypo-responsiveness is antigen/vaccine-specific at the humoral but not at the cellular level. We found that T-regulatory as well as B-regulatory cells and the production of IL-10 are involved in non/hypo-responsiveness. Non-responsiveness increases with age and in particular vaccination to a novel vaccine in persons > 65 years is associated with a high low/non-responder rate, indicating that vaccine schedules and doses (at least for primary vaccination) should be adapted according to age.

In light of the growing number of allergic but also obese people, our current studies concentrate on these risk groups to reveal whether different vaccination approaches are necessary for optimal protection compared to healthy individuals. These studies are in line with the significant paradigm shift taking place in many fields of medical research and care, and will extend the concept of personalised medicine into the field of vaccinology.

View Abstract

TAGS

, , , , , , ,

Published: 2019
SYNOPSIS

Outbreaks of measles can occur in secondary schools, even when more than 99 percent of the students have been vaccinated and more than 95 percent are immune.

TITLE

Measles outbreak in a fully immunized secondary-school population.

CITATION

Gustafson TL, Lievens AW, Brunell PA, Moellenberg RG, Buttery CM, Sehulster LM. New England Journal of Medicine, 1987 Mar 26;316(13):771-4.

SUMMARY

An outbreak of measles occurred among adolescents in Corpus Christi, Texas, in the spring of 1985, even though vaccination requirements for school attendance had been thoroughly enforced. Serum samples from 1806 students at two secondary schools were obtained eight days after the onset of the first case. Only 4.1 percent of these students (74 of 1806) lacked detectable antibody to measles according to enzyme-linked immunosorbent assay, and more than 99 percent had records of vaccination with live measles vaccine. Stratified analysis showed that the number of doses of vaccine received was the most important predictor of antibody response. Ninety-five percent confidence intervals of seronegative rates were 0 to 3.3 percent for students who had received two prior doses of vaccine, as compared with 3.6 to 6.8 percent for students who had received only a single dose. After the survey, none of the 1732 seropositive students contracted measles. Fourteen of 74 seronegative students, all of whom had been vaccinated, contracted measles. In addition, three seronegative students seroconverted without experiencing any symptoms. We conclude that outbreaks of measles can occur in secondary schools, even when more than 99 percent of the students have been vaccinated and more than 95 percent are immune.

View Abstract

TAGS
Published: 2018
SYNOPSIS

In Israel in 2017, nine measles cases were identified in a population with high measles vaccination coverage.

TITLE

Measles Outbreak in a Highly Vaccinated Population – Israel, July-August 2017

Citation

Avramovich E, Indenbaum V, Haber M, Amitai Z, Tsifanski E, Farjun S, Sarig A, Bracha A, Castillo K, Markovich MP, Galor I. MMWR Morbidity and Mortality Weekly Report. 2018 Oct 26;67(42):1186-1188.

Summary

On August 6, 2017, the Israeli Defense Force Public Heath Branch (IDFPHB) was notified of two suspected measles cases. IDFPHB conducted an epidemiologic investigation, which identified nine measles cases in a population with high measles vaccination coverage. All measles patients had signs and symptoms consistent with modified measles (i.e., less severe disease with milder rash, fever, or both, with or without other mild typical measles symptoms). A total of 1,392 contacts were identified, and 162 received postexposure prophylaxis (PEP) with measles-mumps-rubella (MMR) vaccine; the remaining contacts were followed for 21 days (one incubation period). No tertiary cases were identified.

View Abstract

TAGS
Published: 1984
SYNOPSIS

A computer model was created to study the effect of the measles elimination program in the United States on the number of susceptibles in the population. The simulation reveals that in the prevaccine era, approximately 10.6% of the population was susceptible to measles, most of whom were children less than 10 years of age.

TITLE

The future of measles in highly immunized populations. A modeling approach.

CITATION

Levy DL. American Journal of Epidemiology. 1984 Jul;120(1):39-48.

SUMMARY

Little is known about how an intensive measles elimination program changes the overall immune status of the population. A computer model was created to study the effect of the measles elimination program in the United States on the number of susceptibles in the population. The simulation reveals that in the prevaccine era, approximately 10.6% of the population was susceptible to measles, most of whom were children less than 10 years of age. With the institution of the measles immunization program, the proportion of susceptibles in the population fell to 3.1% from 1978 through 1981, but then began to rise by approximately 0.1% per year to reach about 10.9% in the year 2050. The susceptibles at this time were distributed evenly throughout all age groups. The model did not consider the potential effect of waning immunity. The results of this study suggest that measles elimination in the United States has been achieved by an effective immunization program aimed at young susceptibles combined with a highly, naturally immunized adult population. However, despite short-term success in eliminating the disease, long-range projections demonstrate that the proportion of susceptibles in the year 2050 may be greater than in the prevaccine era. Present vaccine technology and public health policy must be altered to deal with this eventuality.

View Abstract

TAGS

Published: 1982
SYNOPSIS

The 1989 measles outbreak in the province of Quebec has been largely attributed to an incomplete vaccination coverage, despite a 99% vaccination rate.

TITLE

Major measles epidemic in the region of Quebec despite a 99% vaccine coverage

Citation

Boulianne N, De Serres G, Duval B, Joly JR, Meyer F, Déry P, Alary M, Le Hénaff D, Thériault N. Canadian Journal of Public Health. 1991 May-Jun;82(3):189-90.

Summary

The 1989 measles outbreak in the province of Quebec has been largely attributed to an incomplete vaccination coverage. In the Quebec City area (pop. 600,000) 1,363 confirmed cases of measles did occur. A case-control study conducted to evaluate risk factors for measles allowed us to estimate vaccination coverage.  The vaccination coverage among cases was at least 84.5%. Vaccination coverage for the total population was 99.0%. Incomplete vaccination coverage is not a valid explanation for the Quebec City measles outbreak.

View Abstract

TAGS