New dengue vaccine could instead cause more cases, experts warn
Key Excerpts from Article on Website of CNN News
Posted: September 11th, 2016
The newly licensed vaccine against the dengue virus - trade name Dengvaxia - could lead to an increase in the number of cases of the disease if not implemented correctly, experts warn in a new study. The number of people affected by dengue has increased in recent years, with 390 million people estimated to be infected each year. Cases of the disease have [been] reported in more than 100 countries worldwide. Dengvaxia was produced by Sanofi Pasteur, which, after spending 20 years developing the vaccine, published promising findings on its effectiveness in 2015. Trials showed the vaccine to be 59.2% effective against dengue when results were pooled across populations and age groups. [Study author] Neil Ferguson used data from the clinical trials to assess the impact of using the vaccine in different settings and found that its use in areas with low levels of disease, where people are unlikely to have been previously exposed to dengue, could lead to an increase in people severely affected by the infection due to the complexities of the virus and the way it interacts with our immune system. "Unlike most diseases, the second time you get dengue, it's much more likely to be severe than the first time you get it," Ferguson said. When people who have never experienced the infection get immunized, the vaccine may act like a silent infection, gearing them up for a more severe infection should they face the real form of the virus. "It can have the potential to make things worse if it's misused," Ferguson said.
Note: Dengue fever is carried by aedes aegypti mosquitoes, which also carry zika virus. For more along these lines, see concise summaries of deeply revealing vaccine news articles from reliable major media sources.