Podcast
Questions and Answers
What is the primary mode of transmission of Chlamydia?
What is the primary mode of transmission of Chlamydia?
- Airborne
- Vector-borne
- Contaminated food and water
- Sexual contact
Which of the following is a characteristic of Mycoplasma?
Which of the following is a characteristic of Mycoplasma?
- Gram-negative
- Gram-positive
- Motile
- Lack of cell walls (correct)
What is the most common symptom of Chlamydia in women?
What is the most common symptom of Chlamydia in women?
- Abdominal pain
- Pelvic inflammatory disease
- Fever
- Asymptomatic (correct)
Mycoplasma is typically found in which environment?
Mycoplasma is typically found in which environment?
Chlamydia is caused by which type of bacteria?
Chlamydia is caused by which type of bacteria?
What is the most frequent cause of STD in the U.S.?
What is the most frequent cause of STD in the U.S.?
What is the result of untreated trachoma?
What is the result of untreated trachoma?
What is the mode of transmission for neonatal inclusion conjunctivitis?
What is the mode of transmission for neonatal inclusion conjunctivitis?
What is the result of the host's inflammatory response to Chlamydia?
What is the result of the host's inflammatory response to Chlamydia?
What is the typical timing of neonatal inclusion conjunctivitis after birth?
What is the typical timing of neonatal inclusion conjunctivitis after birth?
What is the characteristic of the adult form of inclusion conjunctivitis?
What is the characteristic of the adult form of inclusion conjunctivitis?
What is the usual mode of transmission for trachoma?
What is the usual mode of transmission for trachoma?
What is the clinical manifestation of trachoma?
What is the clinical manifestation of trachoma?
What is the significance of Chlamydia trachomatis in developing countries?
What is the significance of Chlamydia trachomatis in developing countries?
What is the relationship between Chlamydia and nutrients?
What is the relationship between Chlamydia and nutrients?
What percentage of nongonococcal urethritis in men is caused by C.trachomatis?
What percentage of nongonococcal urethritis in men is caused by C.trachomatis?
What is the common syndrome seen in females infected with C.trachomatis?
What is the common syndrome seen in females infected with C.trachomatis?
What is the primary treatment for Chlamydia infections?
What is the primary treatment for Chlamydia infections?
What is the number of common STDs that C.trachomatis is one of?
What is the number of common STDs that C.trachomatis is one of?
What is the number of annual cases of C.trachomatis?
What is the number of annual cases of C.trachomatis?
Which of the following diagnostic methods is most sensitive and specific for Chlamydia?
Which of the following diagnostic methods is most sensitive and specific for Chlamydia?
What is the purpose of Iodine staining in the diagnosis of Chlamydia?
What is the purpose of Iodine staining in the diagnosis of Chlamydia?
What is the common manifestation of LGV?
What is the common manifestation of LGV?
Which of the following organisms is associated with urogenital infections?
Which of the following organisms is associated with urogenital infections?
What is the common systemic manifestation of LGV?
What is the common systemic manifestation of LGV?
What is the purpose of Serology in the diagnosis of Chlamydia?
What is the purpose of Serology in the diagnosis of Chlamydia?
What is the diagnosis of LGV based on?
What is the diagnosis of LGV based on?
Which of the following diagnostic methods detects organisms in clinical samples?
Which of the following diagnostic methods detects organisms in clinical samples?
What is the number of annual cases of psittacosis in the U.S.?
What is the number of annual cases of psittacosis in the U.S.?
What is the characteristic of inclusions in cells infected with Chlamydia?
What is the characteristic of inclusions in cells infected with Chlamydia?
Which of the following is a type of Chlamydia?
Which of the following is a type of Chlamydia?
Study Notes
Chlamydia and Mycoplasma
Chlamydia
- Primary mode of transmission: Sexual contact
- Caused by: Chlamydia trachomatis, a type of bacterium
- Most common symptom in women: Asymptomatic, but can cause abnormal vaginal discharge, burning sensation while urinating, or abdominal pain
Mycoplasma
- Characteristic: Lacks a cell wall
- Typically found in: Respiratory tract, particularly in the mucous membrane of the lungs
Chlamydiae Characteristics
- Possess DNA and RNA
- Multiply via binary fission
- Susceptible to several antibiotics
- Small, variable shape (generally rounded)
- Unusual replicative cycle
Life Cycle
- Elementary body: small, extracellular, infectious stage
- Enters via endocytosis and resides within phagosome
- Metabolically active and reorganizes within one hour of infection into reticulate body
Reticulate Body
- Larger, intracellular, non-infectious
- Cannot survive outside of cell
- Uses host ATP to divide
- After 24-72 hours, becomes elementary body
- Replicates within cytoplasm of host cells
- Intracellular inclusions can be seen by light microscope
- Between 48-72 hours, cell ruptures and infective elementary bodies are released
Virulence Factors
- Not completely known
- Produce heat-labile toxins
- Compete with host cell for nutrients
- Cause tissue damage and cell death
Chlamydia Trachomatis
- Divided into 3 biovars
- Cause eye infections (two forms): trachoma and inclusion conjunctivitis
Trachoma
- Caused by serotypes A, B, Ba, and C
- Chronic keratoconjunctivitis
- More common in developing countries
- Transmission through droplet, hands, fomites, and flies
- Leading cause of preventable blindness in developing countries
Inclusion Conjunctivitis
- Acute inflammation of conjunctiva seen in adults and infants
- Common in populations with high numbers of Chlamydia genital infections
- Neonatal form results from direct contact with infected cervical secretions
- Presents as acute, copious, mucopurulent eye discharge
- Symptoms can resolve without treatment
Genital Infection
- Most frequent cause of STD in U.S.
- Treatment: antimicrobials, tetracycline, erythromycin, sulfonamides, and rifampin
- Control: treat known cases, prevent exposure
Diagnostics
- Isolation: most sensitive and specific method
- Direct staining: Giemsa, iodine, or immunofluorescence
- ELISA: used to detect organisms in clinical samples
- Serology: used to diagnose acute infections, must show 4-fold titer increase, high IgM suggestive of recent infection
Chlamydophila Pneumoniae
- Worldwide distribution
- Infections seen between 7-30 years of age
- Infections usually mild to moderate, but can be severe in elderly
- Associated with pneumonia, bronchitis, pharyngitis, sinusitis, and flu-like illness
- Diagnosis based on clinical presentation and laboratory tests
Mycoplasmataceae
- Urogenital infections: Mycoplasma hominis, Ureaplasma urealyticum, and Ureaplasma parvum
- Respiratory infections: M. pneumoniae
- Distinct venereal disease from C. trachomatis
- One of 5 common STDs: gonorrhoeae, syphilis, herpes, chancroid
LGV (Lymphogranuloma Venereum)
- Systemic manifestations: hepatitis, pneumonitis, meningoencephalitis
- Diagnosis: characteristic appearance, laboratory tests
- Two stages: genital lesion, lymph adenitis
Chlamydophila (Chlamydia) Psittaci
- Cause of psittacosis among psittacine birds
- Parrot fever
- Diagnosis: based on history of exposure to psittacines, serology
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Description
Test your knowledge on Chlamydia and Mycoplasma, including transmission, characteristics, symptoms, and environment. This quiz covers the basics of these microbiology topics.