Infectious Disease Flashcards
What is an infectious disease?
Illness caused by specific infectious agent or its toxic product that results from transmission from an infected person or animal directly or indirectly
What are factors that affect the immune system?
Pregnancy
Age
Malignancy
Malnutrition
Immunosuppressive disease and treatment
Stress
Age
Obesity
Lymph trauma
What is the definition of a virus?
Subcellular organism made up only of RNA or DNA covered with proteins
Why are new vaccinations often needed to be created to treat viruses?
They have rapid replication and high mutation rates
Why do most viruses not require specific antiviral therapy?
They are self limiting
What are not effective for viruses?
Antibiotics
What are types of viruses?
Flu, herpes, hepatitis, cold
What is the definition of bacteria?
Single-celled microorganism with well defined cell walls that can grow independently on artificial media without the need for other cells
How is bacteria classified?
By shape and oxygen need
What percentage of bacteria makes up human pathogens?
38%
How is bacteria treated?
Antibiotics (may need labs to determine gram stain)
What are types of bacteria?
Streptococcus, staphylococcus, clostridium, and escherichia coli
What is the definition of fungi?
Single celled or multicellular organism
What are the two forms of fungi?
True pathogen (causes infections in healthy people)
Opportunistic pathogen (causes infection in immunocompromised people)
What does the common fungus yeast cause?
Thrust, diaper rash, and athletes foot
What is the treatment of fungi?
Antifungals or antivirals applied directly to the skin (injected in serious cases)
What is the definition of a parasite?
Organism that lives on or in a host and gets its food from or at the expense of the host
Where are parasites more common?
Rural or developing areas
What is the mode of infections for parasites?
Through mouth or skin
What are common types of parasites?
Pinworms and malaria from mosquitos
What is the treatment of parasites?
Anti-parasitic drugs
What is the definition of prions?
Infectious agent composed of protein material that can fold in multiple distinct ways leading to disease similar to viral infection
What is the mode of transmission for prions?
Animal to human
What are prions characterized by?
Long latent interval in the host that when reactivated causes a rapid deteriorating state