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2. Coronavirus - Wikipedia

   en.wikipedia.org/wiki/Coronavirus

   Main article: History of coronavirus. Colorized transmission electron micrograph of coronavirus 229E. The earliest reports of a coronavirus infection in animals occurred in the late 1920s, when an acute respiratory infection of domesticated chickens emerged in North America. [15] Arthur Schalk and M.C. Hawn in 1931 made the first detailed ...

3. Tobacco mosaic virus - Wikipedia

   en.wikipedia.org/wiki/Tobacco_mosaic_virus

   Tobacco mosaic virus ( TMV) is a positive-sense single-stranded RNA virus species in the genus Tobamovirus that infects a wide range of plants, especially tobacco and other members of the family Solanaceae. The infection causes characteristic patterns, such as " mosaic "-like mottling and discoloration on the leaves (hence the name).

4. Hepatitis B virus - Wikipedia

   en.wikipedia.org/wiki/Hepatitis_B_virus

   Hepatitis B virus is a member of the Hepadnavirus family. The virus particle, called Dane particle , consists of an outer lipid envelope and an icosahedral nucleocapsid core composed of protein. The nucleocapsid encloses the viral DNA and a DNA polymerase that has reverse transcriptase activity similar to retroviruses.

5. Bacteriophage - Wikipedia

   en.wikipedia.org/wiki/Bacteriophage

   Bacteriophage. Anatomy and infection cycle of bacteriophage T4. A bacteriophage ( / bækˈtɪərioʊfeɪdʒ / ), also known informally as a phage ( / ˈfeɪdʒ / ), is a virus that infects and replicates within bacteria and archaea. The term was derived from "bacteria" and the Greek φαγεῖν ( phagein ), meaning "to devour".

6. SARS-CoV-2 - Wikipedia

   en.wikipedia.org/wiki/SARS-CoV-2

   Virus infections start when viral particles bind to host surface cellular receptors. Protein modeling experiments on the spike protein of the virus soon suggested that SARS‑CoV‑2 has sufficient affinity to the receptor angiotensin converting enzyme 2 (ACE2) on human cells to use them as a mechanism of cell entry.

7. Respiratory syncytial virus - Wikipedia

   en.wikipedia.org/wiki/Respiratory_syncytial_virus

   Respiratory syncytial virus ( RSV ), [a] also called human respiratory syncytial virus ( hRSV) and human orthopneumovirus, is a contagious virus that causes infections of the respiratory tract. It is a negative-sense, single-stranded RNA virus. [2] Its name is derived from the large cells known as syncytia that form when infected cells fuse.