21. The grey squirrel is a carrier of the squirrel pox virus which kills red squirrels but not grey squirrels. 22. Avian pox virus infections which cause warts on the face have been observed in a wild bird living in Taiwan. 23. The vaccine contains a live weakened strain of the chicken pox virus that causes an infection that produces no symptoms. 24. The small pox virus , for instance, has only about a tenth of the DNA bases found in the Hemphilus influenzae. 25. The vaccine consists of a harmless canary pox virus that is genetically engineered to carry several genes that make HIV proteins. 26. The chicken pox virus , for example, persists in the body after a childhood attack, to come back as shingles in adulthood. 27. "' Methisazone "'( INN ) is an antiviral drug that works by inhibiting mRNA and protein synthesis, especially in pox viruses . 28. Shingles is an infection by the chicken-pox virus of nerves supplying certain areas of the skin, usually in people over 50. 29. The procedure being used gives " a much more effective immunization than with the pox virus alone or by the DNA alone," 30. A handful of vaccine candidates, including a federally supported one involving a weakened canary pox virus , are at various stages of development.
