GIDEON what’s new summary: May 19 to May 22, 2019
- 7 Diseases
- 358 Clinical notes
- 32 Diseases
- 39 Country notes
- 2 New Disease Synonyms Added
- 1 Bacteria
GIDEON what’s new summary: May 1 to May 4, 2019
Although two fatal cases of diphtheria were recently reported in Thailand , rates of this disease have declined dramatically since the 1970’s. In fact, Thailand can serve as an icon for the effectiveness of vaccination. In the following graph, I’ve contrasted rates of diphtheria, pertussis and tetanus with WHO estimates of DPT vaccine uptake. The second graph depicts the effect of DPT vaccination on diphtheria mortality in this country. [2,3]
Note featured on ProMED
The following is a country-by-country analysis of measles reporting trends vs. vaccine uptake. For purposes of consistency, incidence data and population statistics used to calculate rates per 100,000 will be limited to those published by the World Health Organization (WHO). Resultant graphs were generated by Gideon and abstracted from the Gideon e-book series [1,2] True estimates of vaccination update statistics are those published by WHO, in most cases available only since 1980. Data published by the countries themselves were not used, to avoid possible bias or inconsistency when comparing data among countries. Historical disease data which precede 1980 have also been appended to graphs to further appreciate the impact of vaccination.
The reader will note that in virtually all cases, the presumed impact of vaccine uptake on disease incidence occurs when vaccine uptake exceeds 80%, and again when rates increase beyond 90%. As such, the few countries which have not achieved 80% uptake, or have consistently reported >90% uptake since 1980 are excluded. Graphs are not included for countries for which data are not reported, or reported only sporadically.
Individual graphs for 135 countries are presented below in alphabetical order. In 127 (94%) of these, a clear relationship seems to exist between increasing vaccine uptake and decreasing rates of measles. In eight cases, temporary “spikes” in disease incidence were reported during years of high vaccine uptake: Japan, Jordan, Republic of Korea, Seychelles, Solomon Islands, South Africa, Sri Lanka and Syria.
I have not attempted to perform a statistical analysis of this phenomenon, and cannot say with certainty that a confounding (third) factor does not exist. Nevertheless, these graphs appear to indicate a favorable effect of vaccination on measles incidence.
Measles Vaccine Uptake vs. Disease rates (per 100,000)