The duo first reanalyzed data from a 2007 paper in PloS Pathogens by Peter Palese of Mount Sinai School of Medicine in New York City and his colleagues, who found that virus transmission between two guinea pigs housed in neighboring cages falls as relative humidity rises (ScienceNOW, 19 October 2007).
The Mann–Whitney U test was used to analyse differences in virus loads between two groups.
Even in the absence of antiretroviral therapy, the amount of HIV-1 in breast milk is usually 10 100 fold less than that present in plasma, which suggests limited exchange of virus between these two sites [14].
If these viruses recombine between two or more subtypes (parental subtype) and spread in the host population, they are designated as circulating recombinant forms (CRF).
We then compared weight loss, survival, lung pathologies, cytokine/chemokine responses and virus replication between one of the highly susceptible strains, DBA/2J, and one of the more resistant strains, C57BL/6J.
Variability in virus prevalence between eight to 30% in growing pigs reported in the study by Duinhof et al, (2011), could have resulted in our sample size being insufficient to detect the virus and thus obtaining false negative results.
One main concern is the possibility that reconstruction of standard virus by recombination between two defective genomes would generate a competent virus able to replicate and cause disease.
There have been cases where the virus has spread between two people but close contact seems to be needed.
However, the transmission of viruses between the two countries in either direction cannot be denied.
Viral population entropy and diversity are also comparable in the genital tract and peripheral blood of subjects we and others [10], [15] have studied, which suggests similar immune pressures or mixing of viruses between these two tissues.
