VALHALLA, N.Y., June 18, 2004--A New York Medical College microbiologist warns that live virus vaccines to prevent infectious diseases like West Nile virus and yellow fever could have dire consequences. Should one of the vaccine flaviviruses recombine with a wild-type virus, a new microbe with potentially undesirable properties could result, according to Stephen J. Seligman, M.D., research professor of microbiology and immunology.

His paper, "Live flavivirus vaccines: reasons for caution" appears as a rapid review article in the June 19, 2004, issue of the journal Lancet. Co-author is Ernest A. Gould, Ph.D., of CEH-Oxford in the UK.

Flaviviruses, which can recombine within species and may recombine between species, also include dengue, Japanese encephalitis and tick-borne encephalitis. They cause substantial sickness and death each year. Although live-virus vaccines offer great promise in terms of cost and efficacy, their use should be approved by an international authority due to safety concerns, the authors write.

The article lists five main lessons learned from other live virus vaccines:

reversion of vaccine strains to increased virulence;

development of disease in individuals with compromised immune systems;

birth defects, particularly if the vaccine is given in the first trimester;

spread of vaccine strains to unvaccinated persons and;

the discovery of new, previously undetermined complications.

'"/>

Contact: Donna E. Moriarty
donna_moriarty@nymc.edu
914-594-4536
New York Medical College
18-Jun-2004


Page: 1
Related biology news :

1. Researchers determine genetic cause of Timothy syndrome
2. Researchers find color sensitive atomic switch in bacteria
3. Researchers identify protein promoting vascular tumor growth
4. Researchers devise potent new tools to curb ivory poaching
5. Researchers create nanotubes that change colors, form nanocarpet and kill bacteria
6. Researchers ID chlorophyll-regulating gene
7. Researchers develop fast track way to discover how cells are regulated
8. Researchers identify distinctive signature for metastatic prostate cancer
9. Researchers report new gene test for isolated cleft lip and palate
10. Researchers discover why mutant gene causes colon cancer
11. Researchers identify the genomes controlling elements