This presentation defines viruses and their characteristics such as being the smallest organisms and requiring a host cell. It describes the parts of a virus including the nucleic acid and protein coat. Different shapes of viruses are shown and the 6 steps of the lytic cycle are outlined as adsorption, entry, replication, assembly and release. Common routes of viral transmission like respiratory, fecal-oral, and insect vectors are provided. The Baltimore classification system of viruses is briefly explained grouping them by nucleic acids. Methods to treat viruses like vaccines and reduce risk through hygiene are mentioned.

1. WELCOME

2. PRESENTATION ON
VIRUSES

3. SUBMITTED TO
PROF. DR. IFFAT CHOWDHURY
REGISTRAR
DEPT. OF PHARMACY
UODA

4. SUBMITTED BY
SILVIA SHOMBA
ID. NO. – 031153004
BATCH – 46TH
DEPARTMENT OF PHARMACY
APRIL 5, 2016

5. VIRUS
• Definition
- Smallest organism
- DNA / RNA
- Protective coat
• Characteristics
- Size
- Host cell
- Obligate
- Electron Microscope
- Multiplication
- Resistant

6. VIRUS PARTICLE
Parts Of A Virus
- Nucleic Acid
- Protein Coat
- Lipid Membrane

7. DIFFERENT SHAPES OF VIRUSES

8. VIRAL INFECTION
• How does virus enter
- Nose
- Mouth
- Skin

9. 6 STEPS OF LYTIC CYCLE
• Adsorption
• Entry
• Injected genetic material
• Replication
• Assembly (Maturation)
• Release of the new
viruses

10. ROUTE OF VIRUSES
Route Example
Skin contact HPV
Respiratory Influenza, Measles, Mumps
Fecal-oral Polio, Rota virus
Trans placental HIV
Sexually HIV, HPV, Hepatitis- B
Insect vector Yellow fever, Dengue Fever

11. CLASSIFICATION OF VIRUSES
(THE BALTIMORE CLASSIFICATION)
Double-stranded DNA.
Single-stranded (+) sense DNA.
Double-stranded RNA.
Single-stranded (+) sense RNA.
Single-stranded (-) sense RNA.
Single-stranded (+) sense RNA with DNA intermediate in life cycle.
Double-stranded DNA with RNA intermediate.

12. VIRAL TREATMENTS & REDUCE THE RISK
• Vaccines or Immunizations
• Stop spreading viruses
- Covering mouth & nose
- Washing hands
- Drinking pure water
- Avoid bodily fluid contact

13. THANK YOU