Natural Blaze | 27 June 2015
A study just published in BMC Medicine by Santa Fe Institute Omidyar Fellows Ben Althouse and Sam Scarpino used algorithms to see what caused a resurgence of whooping cough (pertussis) in the U.S. and UK.
It has now been openly declared that the DTaP vaccine is causing the uptick in whooping cough.
Out of the hypotheses, asymptomatic shedding was the final detectable problem. However, the authors have more to say on it, some of which sounds very contradictory coming from researchers who have proven that the mechanism of the acellular DTaP is, in part responsible for the spread of a dangerous bacterium.
- Researchers hypothesize 4 causes of whooping cough (pertussis) resurgence, zeroing in on low vaccine coverage and unvaccinated populations, failure of vaccine, microbial resistance, and asymptomatic shedding from newer, acellular vaccines.
- Vaccinating individuals in close contact with infants too young to receive the vaccine (“cocooning” unvaccinated children) may be ineffective and prove negative.
- It isn’t really explained how asymptomatic transmission accounts for infecting the vaccinated population and why even more vaccine coverage would help…
- Authors claim that before a new vaccine is ready for clinical use, other options are necessary for reducing incidence, including vaccination of pregnant women
- According to Science Daily’s assessment which focuses on “anti-vaccine” sentiment, the authors vigorously want higher DTaP rates regardless, and present the information for policy and vaccine makers. Other outlets have implicated that a demand for safer vaccines in the 1990s caused the problem, but they dismiss death and injury associated with previous whole-cell vaccines. The burden of safety is to be on the manufacturers.
Excerpts from the study found here are reprinted with credit under a Creative Commons license:
Authors: Benjamin M. Althouse and Samuel V. Scarpino
The recent increase in whooping cough incidence (primarily caused by Bordetella pertussis) presents a challenge to both public health practitioners and scientists trying to understand the mechanisms behind its resurgence. Three main hypotheses have been proposed to explain the resurgence: 1) waning of protective immunity from vaccination or natural infection over time, 2) evolution of B. pertussis to escape protective immunity, and 3) low vaccine coverage. Recent studies have suggested a fourth mechanism: asymptomatic transmission from individuals vaccinated with the currently used acellular B. pertussis vaccines.
Using wavelet analyses of B. pertussis incidence in the United States (US) and United Kingdom (UK) and a phylodynamic analysis of 36 clinical B. pertussis isolates from the US, we find evidence in support of asymptomatic transmission of B. pertussis. Next, we examine the clinical, public health, and epidemiological consequences of asymptomatic B. pertussis transmission using a mathematical model.
We find that:
1) the timing of changes in age-specific attack rates observed in the US and UK are consistent with asymptomatic transmission;
2) the phylodynamic analysis of the US sequences indicates more genetic diversity in the overall bacterial population than would be suggested by the observed number of infections, a pattern expected with asymptomatic transmission;
3) asymptomatic infections can bias assessments of vaccine efficacy based on observations of B. pertussis-free weeks;
4) asymptomatic transmission can account for the observed increase in B. pertussis incidence; and
5) vaccinating individuals in close contact with infants too young to receive the vaccine (“cocooning” unvaccinated children) may be ineffective.
Although a clear role for the previously suggested mechanisms still exists, asymptomatic transmission is the most parsimonious explanation for many of the observations surrounding the resurgence of B. pertussis in the US and UK. These results have important implications for B. pertussis vaccination policy and present a complicated scenario for achieving herd immunity and B. pertussis eradication.
Extended Conclusion [emphasis added by H.C.]
That there has been a rise in whooping cough incidence in many countries around the globe is irrefutable. The findings presented in Warfel et al., in conjunction with ours, have profound implications for the understanding of B. pertussis transmission dynamics and for vaccination policy. Specifically, our results would explain the negative outcomes found in recent studies of postnatal cocooning ,  and would further complicate efforts to achieve herd immunity and possible eradication . Long-term solutions to B. pertussis vaccination are necessary, and new vaccines are in development , . In the years before a new vaccine is ready for clinical use, other options are necessary for reducing incidence, including vaccination of pregnant women ,  or potentially a switch back to wP vaccination as a priming dose –.
Clearly, more research is necessary, but if our results hold, public health authorities may be facing a situation similar to that of polio, where vaccinated individuals can still transmit infection . This suggests further modifications of recommendations to clinicians for protecting unvaccinated children  and ensuring that aP coverage remains high. Our results on the potential surveillance bias associated with B. pertussis incidence highlight a critical need for population-wide serological surveys to detect recent infection, studies to examine the genetic diversity of the B. pertussisbacterium, more detailed studies of the incidence rate in unvaccinated individuals, and increased active surveillance of attenuated symptomatic B. pertussis infections. In light of current evidence and our results, we cannot dismiss the potential far-reaching epidemiological consequences of asymptomatic transmission of B. pertussis and an ineffective B. pertussis vaccine.
Heather Callaghan is a natural health blogger and food freedom activist. You can see her work at NaturalBlaze.com and ActivistPost.com. Like at Facebook.
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