MICRO 4/20 FINAL

Angraft Definition: Inhalation angraft is a serious infection that occurs when anthrax spores are inhaled, leading to severe pneumonia.
  - Cutaneous Angraft: This form causes skin infections.
  - Severity of Inhalation: Inhaled anthrax causes pneumonia that is often severe and sudden due to toxin secretion by Anthrax bacteria.
  - Commonality: Anthrax bacteria are typically found in soil; cutaneous infections are more common and less severe than inhaled anthrax.
Bioterrorism Concern:
  - Spores as Bioweapons: Anthrax spores can be weaponized due to their ability to survive harsh conditions.
  - Historical Context: In 2001, anthrax spores were mailed, resulting in severe pneumonia symptoms and several deaths, despite antibiotic treatment.
  - Statistics: There were approximately three to four deaths linked to anthrax letters sent in 2001.

Causing Agent: Legionnaires' disease is caused by Legionella pneumophila.
  - Name Origin: Named after an outbreak among attendees of a Legion Club conference in Philadelphia.
  - Transmission: Spread through contaminated water in cooling systems; older adults are more susceptible.
  - Survival Conditions: Legionella thrives in warm damp conditions, posing a risk in buildings with swamp cooling systems.
Symptoms and Treatment: Causes pneumonia, particularly fatal in vulnerable populations. No vaccine exists, and prevention focuses on proper maintenance of water systems.

Causative Agent: Caused by Coxiella burnetii, a zoonotic bacteria transferred from animals to humans, especially during birthing processes.
  - Infection Insights: Found in animal placentas and can last for years in soil.
  - Symptoms: Includes fever, chills, headache, and pneumonia, but is not particularly fatal (1-2% mortality).
  - Treatment: Antibiotics may help with the duration, but many cases resolve without treatment.

Flu Virus (Influenza)
- Serotypes: Comes in three types: A, B, and C, with A and B being the most common.
- Characteristics: An enveloped virus that mutates rapidly through antigenic drift (slow mutations) and antigenic shift (recombination with other flu viruses).
Epidemiology and Impact: Influenza can be deadly, causing around 60,000 deaths annually in the U.S. Misconceptions about the flu's severity are common; it is much more serious than typical colds.
- Treatment: Supportive care, with antivirals (like Tamiflu) being effective if taken early.
Respiratory Syncytial Virus (RSV)
  - Prevalence: Very common among children and can lead to severe diseases, especially in infants and the elderly.
  - Symptoms: Starts with cold-like symptoms, advancing to bronchial infections, resulting in significant hospitalization rates in children.
  - Vaccine and Treatment: A vaccine exists for infants and treatment focuses on supportive care.
Hantavirus
  - Transmission: Primarily through inhalation of dust from rodent droppings; considered a zoonotic virus.
  - Mortality Rate: Very severe, with a mortality rate of 50-70%.
  - Symptoms: Causes severe pneumonia, and no specific treatment exists; supportive care is the only recourse.

Common Infections: Includes pneumocystis pneumonia, blastomycosis, histoplasmosis, coccidioidomycosis, and aspergillosis.
- Affected Populations: Although these infections can randomly affect healthy individuals, they primarily impact those with compromised immune systems.

Definition: Meningitis is an infection that affects the meninges surrounding the brain and spinal cord.
Types of Meningitis:
- Bacterial Meningitis: A medical emergency that requires immediate treatment as it can be fatal if untreated. Common pathogens include Streptococcus pneumoniae, Haemophilus influenzae, and Neisseria meningitidis.
- Viral Meningitis: Generally less severe and tends to resolve on its own, with supportive care being the main treatment.
Routes of Infection: Can occur through blood, sinuses, or surgical shunts.
Symptoms: Key symptoms of meningitis include severe headaches, stiff neck, photophobia, and flu-like symptoms.
  - Diagnosis: Often diagnosed via spinal tap to test for the presence of bacteria in cerebrospinal fluid.
  - Importance of Prompt Treatment: Rapid identification between bacterial and viral strains is crucial since bacterial infections can lead to serious complications including brain damage or death.
  - Chronic Meningitis: Includes forms that result from tuberculosis but will not be covered in detail here.
Preventive Measures: Vaccines are available for certain types, particularly for college-aged individuals.