The agent used for immunization should not be transmissible to susceptible contacts of the person being vaccinated.
With climatic warming the seasonal duration of freezing temperatures in the Arctic will be shortened such that thawing carcasses will ultimately decompose to the extent that the virus will not be transmissible.
This gamete, which has a duplication for the majority of the short arm of chromosome 5 and is deficient for a small region of chromosome 6, is female transmissible but can not be transmitted through the male parent [ 17].
Behavioural changes occurring as a response to environmental challenges such as stress are normally considered not to be transmissible to offspring.
SARS-CoV has now been shown to infect (although not necessarily be transmissible through) other animals, including macaques (7 ), ferrets and cats (8 ), and pigs and chickens (9 ), although none of these animals are known to act as natural amplifying hosts for the virus.
Although viremia was demonstrated 10 days after symptom onset, and we can reliably suppose that it started when fever and chills appeared, the probability of a susceptible vector in Europe is small, and the infection seems not to be transmissible from human to human.
Over one third of contacts who did not attend their appointment did not believe TB was transmissible.
Contentions that H5N1 mutant strains might not be highly transmissible or as pathogenic as wild-type H5N1 strains in humans (20) may therefore be falsely reassuring.
Conversely, the virus may not be highly transmissible by peridomestic mosquitoes (14 ) and may be confined to the enzootic forest cycle.
In light of the growing number of 'infectious' proteins identified, the term 'prionoid' was coined to distinguish protein aggregates that are likely to not be naturally transmissible between individuals from those that are (prions) (Aguzzi and Rajendran, 2009).
