Infectious Diseases Unit 4 Lesson 4 plan

Do now What are the two ways a pathogen causes damage?

Do now What are the two ways a pathogen causes damage? – Direct – Indirect

Do now What are the two ways a pathogen causes damage? – Direct – Indirect What feature do both types of damage have in common?

Do now What are the two ways a pathogen causes damage? – Direct – Indirect What feature do both types of damage have in common? -They cause host cell lysis

Do now How do you think a virus causes damage to the host?

Discussion How viruses make us sick.

The viral lifecycle has three stages: The virus needs to enter the cell The virus needs to replicate The virus needs to exit the cell

How viruses make us sick Key goal Make more virus!

Remember a virus needs to enter the cell: 1.First the virus attaches to the cell it is going to infect. 2.Then the virus enters the cell. Surface receptors of HINI

Viral replication RNA viruses DNA viruses

Before we can learn how viruses replicate we need to remember molecular dogma! DNARNAProtein

Before we can learn how viruses replicate we need to remember molecular dogma! DNARNAProtein TranscriptionTranslationReplication Where in the cell do these processes take place?

Before we can learn how viruses replicate we need to remember molecular dogma!

DNA viruses follow molecular dogma They need to get their DNA into the nucleus Herpesvirus is a DNA virus DNA DNA  RNA  PROTEIN

host proteins DNA Viruses need host proteins to replicate Herpesvirus is a DNA virus DNA DNA  RNA  PROTEIN

RNA  RNA  PROTEIN RNA viruses bring this enzyme with them 1.RNA viruses defy molecular dogma by making RNA from RNA 2.To do this they bring specialized enzymes with them H1N1

DNA RNA  DNA  RNA  PROTEIN 1.Retroviruses like HIV are RNA viruses 2.They defy molecular dogma! 3.They make DNA from RNA

DNA RNA  DNA  RNA  PROTEIN Retroviruses bring the reverse transcriptase enzyme with them. They use an integrase, to insert the DNA into the host genome. 1.Retroviruses defy molecular dogma by making DNA from RNA 2.To do this they bring specialized enzymes with them

RNA viruses cannot correct errors Random uncorrected mutations in RNA viruses cause Antigenic Drift

Exit strategies Can you remember the exit strategies for: Naked viruses? Enveloped viruses?

Wrap up Recap!