Viruses are non-living particles that can only reproduce inside host cells. They contain genetic material and protein coats. Coronaviruses are a large family of viruses that can infect humans and other animals. COVID-19 is caused by a newly discovered coronavirus called SARS-CoV-2. It spreads primarily through respiratory droplets from infected individuals. Most people experience mild symptoms, but some develop serious breathing difficulties. There is currently no vaccine, though most people recover without treatment. Research is ongoing to better understand the virus and develop treatments.

1. Basics of virus
&
Corona Virus
By: Dr. MohammedAzim Bagban
Assistant professor (Microbiology)
C. U. SHAH Institute of Science

2. What are Viruses?
> Viruses are nonliving entities
which are very minute in size
and become living when they
enter any host cell.
> They have some properties of
life but not others
> A virus is a non-cellular
particle made up of genetic
material (DNA or RNA) and
protein that can invade
living cells.
>
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SARS-CoV-2

3. Discovery
 Viruses can infect all types of life forms, from animals and plants
to microorganisms, including bacteria and archaea.
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 Dmitri Ivanovsky's 1892 article
describing a non
bacterial pathogen infecting tobacco
plants
 The discovery of the Tobacco mosaic
virus by Martinus Beijerinck in 1898

4. Characteristics
 Non living structures
 Non-cellular
 Have a protein coat called the capsid
 Have a nucleic acid core containing DNA
or RNA
 Capable of reproducing only when inside
a HOST cell
 Some viruses may have spikes to help
attach to the host cell
 Most viruses infect only SPECIFIC host
cells
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CAPSID
DNA

5. Viral Shapes
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Helical (e.g. Ebola
Virus)
Polyhedral (e.g.
Adenovirus)
Complex (e.g.
Bacteriophage)
Spherical (e.g.
HIV)

6. Size of Viruses
Corona Avg. 120 nm

7. How Viruses enter into the
cells

8. > Coronaviruses are a large
family of viruses
> COVID-19 is the infectious
disease caused by the most
recently discovered
coronavirus
> The most common symptoms
of COVID-19 are fever, dry
cough, and tiredness. Some
patients may have aches and
pains, nasal congestion, sore
throat or diarrhea.
8
Facts about Corona

9. > Most people (about 80%)
recover from the disease
without needing hospital
treatment.
> Around 1 out of every 5
people who gets COVID-19
becomes seriously ill and
develops difficulty breathing.
> The disease spreads primarily
from person to person
through small droplets from
the nose or mouth.
9
Facts about Corona

10. > Till date, there is no vaccine
and no specific antiviral
medicines against COVID-19.
> However, .people, particularly
those with serious illness,
may need to be hospitalized
so that they can receive life-
saving treatment for
complications.
> The possible animal source of
COVID-19 has not yet been
confirmed but research is
ongoing.
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Facts about Corona

11. Myths about corona
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12. Myths about corona
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13. Myths about corona
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14. Myths about corona
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15. References
> Koonin EV, Senkevich TG, Dolja VV (September 2006). "The ancient Virus World and
evolution of cells". Biology Direct. 1 (1): 29. doi:10.1186/1745-6150-1-29. PMC 1594570.
PMID 16984643.
> Dimmock p. 4
> Collier pp. 33–55
> Collier pp. 33–37
> Arslan D, Legendre M, Seltzer V, Abergel C, Claverie JM (October 2011). "Distant
Mimivirus relative with a larger genome highlights the fundamental features of
Megaviridae". Proceedings of the National Academy of Sciences of the United States of
America. 108 (42): 17486–91.
> Pennisi E (March 2011). "Microbiology. Going viral: exploring the role of viruses in our
bodies". Science. 331 (6024): 1513. Bibcode:2011Sci...331.1513P.
doi:10.1126/science.331.6024.1513. PMID 21436418.
> ICTV Virus Taxonomy ICTV Virus Taxonomy Release History
> https://www.who.int/emergencies/diseases/novel-coronavirus-2019/advice-for-public/myth-
busters
> https://www.who.int/news-room/q-a-detail/q-a-coronaviruses
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16. 16
Thanks!