serial passage

They do not suggest specifically serial passage as the mechanism of adaptation.

However, on initial isolation several serial passages of the virus or, better, the infected culture may be necessary before the effects are recognized.

Moreover, the affects of long term serial passage, both in culture and in animals, are also unknown.

Serial passage is also used in antimicrobial testing to determine how quickly an organism can acquire resistance to an antibiotic.

Serial passage is a virus attenuation technique developed originally by Louis Pasteur in the 1880s.

One advantage that was quickly apparent is that staphylococci did not develop significant resistance despite serial passage in culture media containing vancomycin.

After four serial passages in the immunocompetent mice, the infection became completely refractory to ACV treatment.

Scientists have observed that non-virulent forms of HIV can give rise to virulent strains after serial passage occurs in primates.

All the virus isolates from each serial passage were examined by both PRA and PEA.

Bacteria were cultured introducing frequent bottlenecks and growing cells in serial passage to reduce gene transfer so as to mimic conditions of endosymbiotic bacteria.

This suggests that both HIV-1 and HIV-2 are adapted to humans, and serial passage could have been the process responsible for it.

Dr Das Gupta maintained the species by serial passage in monkeys until Dr Knowles returned from leave.

Prokaryotes where no pure (axenic) cultures are isolated or available, i. e. not cultivated or can not be sustained in culture for more than a few serial passages.

C2C12 cells were originally obtained by Yaffe and Saxel through serial passage of myoblasts cultured from the thigh muscle of C3H mice after a crush injury.

It is easy to select for reduced membrane permeability to chloramphenicol in vitro by serial passage of bacteria, and this is the most common mechanism of low-level chloramphenicol resistance.

Pasteur produced an early rabies vaccine by using serial passage to transmit the virus until an attenuated developed which could be used to stimulate an immune response without causing a pathological infection.

Vaccines that only contain attenuated vaccinia viruses (an attenuated virus is one in which the pathogenicity has been decreased through serial passage) have been proposed, but some researchers have questioned the possible effectiveness of such a vaccine.

Chitnis et al. proposed that both these parenteral risks and the prostitution associated with forced labor camps could have caused serial transmission (or serial passage) of SIV between humans (see discussion of this in the next section).

Marx et al. reported experiments of cross-species transfer of SIV in captive monkeys (some of which made by themselves), in which the use of serial passage helped to adapt SIV to the new monkey species after passage by three or four animals.

According to Marx et al., these studies could have overestimated the age of the HIV groups, because they depend on a molecular clock assumption, may not have accounted for the effects of natural selection in the viruses, and the serial passage process alone would be associated with strong natural selection.

Central to Marx et al. argument is the concept of adaptation by serial passage (or serial transmission): an adventitious virus (or other pathogen) can increase its biological adaptation to a new host species if it is rapidly transmitted between hosts, while each host is still in the acute infection period.

Unlike Marx et al., Gisselquist argued that the millions of unsafe injections administered during these campaigns were sufficient to spread rare HIV infections into an epidemic, and that evolution of HIV through serial passage was not essential to the emergence of the HIV epidemic in the 20th century.