Atypical Pneumonia

Question 1

Most common organism causing atypical pneumonia?

Answer 1

Mycoplasma pneumonia

Question 2

Patient presents with infection unresponsive to penicillins and cephalosporins, colony shoes fried egg shape and cholesterol in cell membrane. What organism caused this infection?

Answer 2

Mycoplasma pneumonia

Question 3

How is mycoplasma pneumonia transmitted?

Answer 3

Respiratory droplets

Question 4

How does mycoplasma pneumonia invade the lungs and damage it?

Answer 4

1- It attaches itself to the lung epithelium by the a protein on its rod tip and stops the ciliary motion causing necrosis of epithelium
2- produces hydrogen peroxide
3- autoantibodies against red cells (cold agglutinins), brain, liver, and lung cells

Question 5

Patient presents to the clinic with a sore throat, earache, myalgia, and whitish Sputum. Abundant infiltration seen on x ray. What is your diagnosis?

Answer 5

Mycoplasma pneumonia

Question 6

How to diagnose M. Pneumonia?

Answer 6

Complement fixation text

Question 7

Iron and cysteine are required for growth of which organism?

Answer 7

Legionella pneumophila

Question 8

How is legionella pneumophila transmitted?

Answer 8

Environmental water sources

Question 9

What are the virulence factors of legionella pneumophila?

Answer 9

1- Lipopolysaccharide

2- intracellular replication

Question 10

Patient presents to clinic confused with microscopic hematuria, non bloody diarrhea and protein urea.
What is your diagnosis and how did you reach it?

Answer 10

1- Atypical pneumonia caused by legionella pneumophila

2- urinary antigen test and charcoal yeast extract agar

Question 11

Pontiac fever is caused by which organism?

Answer 11

Legionella pneumophila

Question 12

What disease does coxiella Burnetti cause?

Answer 12

Q fever

Question 13

Which organisms are obligate intracellular organisms?

Answer 13

1- coxiella burnetti
2- chlamydia pneumoniae
3- chlamydia psittaci

Question 14

Domestic livestock is the habitat of which organism?

Answer 14

Coxiella burnetti

Question 15

How is coxiella burnetti transmitted?

Answer 15

Inhalation of aerosols of urine, feces, amniotic fluid or placental tissue

Question 16

A patient presents with hepatitis and pneumonia. What is your diagnosis

Answer 16

Q fever by coxiella burnetti

Question 17

Why is the Weil-Felix test not used anymore for diagnosis of coxiella burnetti?

Answer 17

Low specificity and sensitivity

Question 18

How does chladmydia pneumoniae divide?

Answer 18

Binary fission giving us daughter reticulate bodies which change back into elementary bodies

Question 19

What are the organisms transmitted from person to person?

Answer 19

1- mycoplasma pneumonia

2- chlamydia pneumoniae

Question 20

Cytoplasmic inclusions are seen in infections by which organisms?

Answer 20

1- chlamydia pneumonia

2- chlamydia psittaci

Question 21

What is the habitat of chlamydia psittaci? How is it transmitted to humans?

Answer 21

1- Birds

2- inhaling dry bird feces