Orthomyxoviridae. Types A, B, C. -ssRNA, enveloped, segmented genome. 8 vRNP (viral ribonucleoprotein segments) in A + B, 7 segments in C. High morbidity and mortality. Must be diagnosed by lab tests.
Types: 16 HA subtypes, 9 NA subtypes. All are in birds. HA 1-3 and NA 1-2 are human flus.
Proteins
Flu
Antivirals
Retroviridae. Diploid +ssRNA with polyA tail +5' cap, tRNA primer binding site, some regions of base pairing. Uses DNA intermediates. Icosahedral, enveloped, has tRNA and enzymes. Avian leukemia virus / Rous Sarcoma chicken tumors were discovered. Can infect vertebrates and plants.
Simple: Only make structural genes (gag, pol, env, maybe src) and do not kill cell.
Complex: Make regulatory genes and may kill cell.
WBCs review
Structural genes and proteins
Regulatory genes and proteins
Accessory genes + oncogene products
Genome regions
Cycle
Lentiretroviridae. Diploid +ssRNA, enveloped. Structural, regulatory, and accessory genes. Long incubation period (30 years), Causes AIDS and Kaposi's Sarcoma. Lowers T cells and increases opportunistic infections.
Discovery
mRNA splicing
30 alternative mRNAs, many polycistronic (many ORFs, single gene product is cleaved into different products).
Disease
Cycle
Natural immunity
Statistics
+ssRNA. Most are arboviruses (arthropod borne). Infection of mosquitoes causes a persistent infection, not cytopathic.
Alphavirus: Sindbis, Semliki Forest, Ross River. Infect birds and mammals. Most transmitted by mosquitoes. 11kb.
Rubivirus: Rubella virus. "German measles". Not transmitted by mosquitoes. 9kb.
Virion
Nonstructural proteins
Structural proteins
Disease
Old World: Sindbis, Semliki Forest, Ross River, Chikungunya. Suppresses host transcription by nsP2.
New World: Western, Eastern, and Venezuelan Equine Encephalitis Viruses. Suppresses host transcription by capsid.
Chikungunya: "That which bends up". Debilitating illness, can cause arthralgia. Spread by Aedes aegypti and Aedes albopictus. Found in Tanzania, spread to other parts of Africa and parts of Asia. Can last a week to months. Hemorragic fever in South Asia, transmitted to Europe / Italy by travelers, caused recent outbreak by mosquitoes in Americas. No vaccine or treatment, can only treat symptoms.
Groups: Based on genome sequence.
Virion
Envelope proteins
Disease
Respiratory illness, 30% of common colds, rarely gastroenteritis and encephalitis. Feline peritonitis, bronchitis in animals, mouse hepatitis.
Variants
Filoviruses, Arenaviruses, Bunyaviruses, Flaviviruses. In Africa, Asia and places without proper healthcare. Study in primates, guinea pigs, and mice. Make good bioweapons if turned into an aerosol because low infection dose, high morbidity and mortality (90%), no vaccine or treatments.
Disease
Monomegalovirales. Nonsegmented -ssRNA, enveloped. Ebola, Marburg, Cueva (Lloviu infects bats).
Virion
Proteins
Disease
Ebola
6 species (Zaire, Sudan, Reston, Tai Forest, Bundibugyo, Bombali).
Marburg
1 species, 7 strains. First case in Germany.
In Africa and South America. Transmit through rodents' urine, feces, excrements, natal between rodents and humans.
Virion
Proteins
Disease
Flaviviridae. +ssRNA. Includes Hepacivirus (infects humans) and Pegivirus (+ bats and monkeys).
Virion
Disease
7 genotypes, 75% are Type 1 (1a, 1b). First isolated in 1989 by cDNA cloning. >4 million cases in the US, 170 million cases worldwide, 1/2 are unaware. Routine testing for baby boomers.
Virion
Disease
Infects only human livers, attaches by receptor induced endocytosis. Causes chronic hepatitis and Hepatocellular carcinoma. Transmits through blood, needles, sexual contact.
Small dsDNA tumor virus. Infect specific vertebrate hosts, name based on species they infect and # of identification.
Virion
Proteins
Early nonstructural, late structural.
Disease
Most common STI, 1% of infections persist.
Spread lesions (creep), 9 human herpesviruses including herpes simplex, varicella zoster, epstein barr, cytomegalovirus. Over 100 known species. Known since Greek philosophers' times.
Types
Virion
Proteins
Temporal gene expression
Disease
Blistering skin lesions, large enough to see under a light microscope.
Types
Virion
Gene expression
Immunomodulary strategies
Disease