H37Rv and H37Ra are both strains of M. tuberculosis representing virulent (Rv) and avirulent (Ra) strains.
An avirulent pathogen is a pathogen that is unable to cause disease in its host. This may be due to mutations that have reduced its ability to infect or harm the host, making it less pathogenic compared to a virulent pathogen.
A virulent virus is a virus that has severe symptoms and is usually a dangerous disease. A temperate virus is a less violent sickness that may show little to no symptoms.
Ostwald T. Avery's experiment was an extension of the works of Griffith's. Griffith's experiment using virulent and avirulent Streptococcus pneumoniae (which had different colony characteristics) proved that it was possible for the heat killed virulent Streptococcus pneumoniae to pass on the genetic information for formation of smooth colonies to avirulent strains. Avery, Mc Leod and Mc Carty conclusively found out that the genetic material responsible for transfer of characteristics between the strains was DNA. This was achieved by incubating the cell lysate of virulent Streptococcus with proteases, RNAses and DNAses separately before mixing it with avirulent strains. It was found that only when the lysate was incubated with DNAses did the transfer of smooth colony formation characteristic from the virulent strain to the avirulent strain fail to occur.
phages of virulent.
The antonyms of virulent: gentle; kind; nice; harmless; healthy; nonpoisonous
Virulent means very posinous or dangerous.
he came down with a virulent type of disease
virulent
this bacteria is virulent strain
The judge had a virulent criticism after his affair with the intern.
Virulence is the state of being virulent, that is, highly infectious, malignant or deadly.