ADDITIONAL INFORMATION:
· Turril (1938) divided taxonomic studies into three phases α, β and ⱳ.
α Taxonomy- based on gross morphological features.
βTaxonomy – based on morphology, anatomy, cytology, embryology, biochemistry and other branches of study.
ⱳTaxonomy- Neosystematics or biosystematics which is based on all types of evidences including experimental, genetic and evolutionary.
· Twort (1915): Discovered virus-infecting bacteria. They were named bacteriophages by Herelle (1917).
· Delbruck (1938): Discovered that viruses to undergo mutations.
· Lwoff(1953):Discovered temperate cycle in viruses.
· Saffarman and Morris (1963): Discovered cyanophages.
· SARS (Severe Acute Respiratory Syndrome) , caused by Corona RNA virus, similar to that causes cold.
· Bird Flu: Avian influenza which spreads to humans as well.
· Gastric or Peptic Ulcers: Mostly due to bacterium Helicobacter pyroli.
· Bolello Vibrio: A small sized bacteria that attack other bacteria, multiply inside their bodies and cause lysis of host cells. Bdellovibrio bacteriovorous is believed to help maintain purity of Ganges.
· Death Factors: Three types-VFDF (Very Fast Death Factor), FDF (Fast Death Factor) and SDF (Slow Death Factor). Toxins from cyanobacteria like Aphanizomenon, Anabaena and Microcystis.
· Phytoalexins:Chemicals produced by plant tissues in response to attack by a parasite for inhibiting the growth of the later.
· Primary Host: Host in which sexual stage of a parasite is passed. Also called definitive host and final host.
· Secondary Host: Host in which parasite passes its asexual phase. Also called intermediate host.
· Reservoir’s Host: An alternate or passive host or carrier that harbours the pathogen without being harmed and serves as a source of infection to others.
· Collateral Host: A substitute host in which the parasite can subsist with or without any apparent harm.
· Autoecious:Parasite passing its different stages in the same single host.
· Digenetic:Requirement of two alternate hosts for completion of life cycle of a parasite.
· Heteroecious: A parasite passing different stages of life history in different hosts.
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