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🧫 TOXOPLASMOSIS — LABORATORY DIAGNOSIS

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🦠 Causative Agent:

Toxoplasma gondii — an obligate intracellular protozoan.
📌 Specimens
• Serum — most commonly used

• Whole blood / EDTA blood

• Amniotic fluid — congenital infection

• CSF — selected cases

• Tissue / lymph node biopsy — selected cases
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🔬 1. DIRECT DETECTION
A. Microscopy
• Tachyzoites may occasionally be demonstrated in tissue or body fluids.

• Sensitivity is generally low, so microscopy is not the preferred routine method.
B. Histopathology
• Tissue sections may demonstrate tachyzoites or tissue cysts.

• Useful in selected cases.
C. PCR
• Detects T. gondii DNA.

• Particularly useful for:
➤ Congenital toxoplasmosis

➤ Amniotic fluid testing

➤ CNS infection in immunocompromised patients
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🧪 2. SEROLOGICAL DIAGNOSIS
Serology is the main laboratory approach for toxoplasmosis.
🔹 Anti-Toxoplasma IgM
• Usually appears early after infection.

• May suggest recent/acute infection.

⚠️ Important: IgM may persist for months, so a positive IgM alone does not prove a recent infection.
🔹 Anti-Toxoplasma IgG
• Appears after IgM.

• Usually persists for long periods, often lifelong.

• Indicates previous exposure/infection.
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⭐ 3. IgG AVIDITY TEST
Used mainly when recent primary infection needs to be distinguished from past infection, especially during pregnancy.
🟢 High IgG avidity
➡️ Suggests infection occurred at least several months earlier

➡️ Helps exclude a very recent primary infection.
🔴 Low IgG avidity
➡️ May be associated with a more recent infection

➡️ Cannot alone prove acute infection.
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🧬 4. COMMON SEROLOGICAL METHODS
• ELISA

• IFA / IFAT

• Immunoblot

• Agglutination tests

• Dye test — reference/classical method
📌 Sabin–Feldman Dye Test
• Detects antibodies against T. gondii.

• Historically considered a reference method but requires live organisms and specialized facilities.
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👶 5. CONGENITAL TOXOPLASMOSIS
For suspected congenital infection:
🧪 Important tests
• Infant-specific IgM
• Infant-specific IgA
• IgG follow-up
• PCR when indicated
📌 Maternal IgG can cross the placenta, so IgG positivity alone in a newborn does not necessarily indicate congenital infection.
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📊 EXAM QUICK REVIEW
🔹 IgM positive
➡️ Possible recent infection

➡️ Confirm/interpret with additional testing.
🔹 IgG positive + IgM negative
➡️ Usually indicates past infection.
🔹 IgG negative + IgM negative
➡️ No serological evidence of previous exposure.
🔹 IgM positive + IgG positive
➡️ Could represent recent infection or persistent IgM

➡️ Consider IgG avidity and/or repeat/confirmatory testing.
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🎯 HIGH-YIELD POINTS
✅ Most commonly used specimen: Serum
✅ Main diagnostic approach: Serology
✅ IgM: Associated with recent infection but may persist
✅ IgG: Indicates exposure and usually persists long-term
✅ IgG avidity: Helps estimate the timing of infection
✅ PCR: Detects T. gondii DNA and is particularly useful in congenital/CNS disease
⚠️ Never diagnose acute toxoplasmosis from IgM positivity alone.
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📚 MLS / COC / EXIT EXAM TIP
💡 Remember:
IgM → Think recent

IgG → Think previous exposure

Avidity → Think timing

PCR → Think DNA detection
🧪🔬 Medical Laboratory Science | Serology & Immunology


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Coc mcq

1.A 31-year-old woman presents with persistent fever, weight loss, abdominal distension, and progressive fatigue. Examination reveals massive splenomegaly. Complete blood count shows pancytopenia. The clinician strongly suspects visceral leishmaniasis.
The laboratory plans to demonstrate the parasite microscopically. However, the patient has a significant bleeding risk, and the clinician wants to avoid a procedure associated with a higher risk of hemorrhage. A bone marrow aspiration is therefore performed.
The aspirate is stained using Giemsa stain. Several macrophages contain small oval intracellular organisms with a nucleus and a characteristic kinetoplast.
Question: Which combination correctly describes the laboratory finding and the form of the parasite being detected?

A. Promastigotes containing a kinetoplast in erythrocytes

B. Amastigotes containing a nucleus and kinetoplast inside macrophages

C. Tachyzoites containing a nucleus inside neutrophils

D. Sporozoites containing a kinetoplast inside hepatocytes

???????????



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የጤና ሙያ ፈቃድ ፈተና ለወሰዳችሁ ጤና ባለሙያዎች በሙሉ
__

በነሀሴ 2018 ዓ.ም በጤና ሚኒስቴር የተሰጠውን የጤና ሙያ የብቃት መዘና ፈተና የወሰዳችሁ ተመዛኞች ከነሀሴ 27/2018 ዓ.ም ጀምሮ https://hple.moh.gov.et ላይ በመግባትና የብሄራዊ መለያ ቁጥር(FAN) እና Password በማስገባት የፈተና ውጤታችሁን መመልከት የምትችሉ መሆኑን እየገለጽን በውጤታችሁ ላይ ቅሬታ ያላችሁ ተመዛኞች ውጤት ከተገለጸበት ዕለት አንስቶ ባሉት 10 (አስር) ተከታታይ የስራ ቀናት በስልክ ቁጥር 952 በስራ ሰዓት በመደወል ሙሉ ስም፣ ዲፓርትመንት እና የተማራችሁበትን የትምህርት ተቋም ስም በማሳወቅ ጥያቄዎቻችሁን ማቅረብ የምትችሉ መሆኑን እንገልፃለን፡፡

ማሳሰቢያ፦                                                                                                                                                1. በዚህ ዙር ለመጀመሪያ ጊዜ ተመዛኞች በተናጠል የውጤት ትንተና (Domain analysis) ማየት የምትችሉ ሲሆን ይህም እራችሁን ለማሻሻል እና የበለጠ ለማብቃት እንደሚጠቅማችሁ መሆኑን እንገልፃለን።                                                    

2. የጤና ሙያ ፈቃድ ፈተናውን ያለፋችሁ ተመዛኞች ከሰኞ ዻጉሜ 2/2018 ዓ.ም ጀምሮ  ስም ዝርዝራችሁ ወደ ክልል የሚላክ ስለሆነ የሙያ ፍቃዳችሁን 12ተኛ ክፍል በተማራችሁበት ክልል ማውጣት የምትችሉ መሆኑን እናሳውቃለን፡፡

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Exit Exam Tips of 2018
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🦠 GRAM POSITIVE RODS (BACILLI)

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🔴 1. Bacillus anthracis ➤ Large Gram +ve rods
➤ Spore forming
➤ Non-motile
➤ “Bamboo stick” appearance

🧫 Culture Media
• Blood agar
• Nutrient agar

⚗️ Biochemical Tests
• Catalase (+)
• Motility (−)

🩺 Disease
• Anthrax

🔬 Lab Findings
• Medusa-head colony
• Boxcar bacilli

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🔴 2. Clostridium tetani ➤ Anaerobic Gram +ve rod
➤ Terminal spore
➤ Drumstick appearance
➤ Motile

🧫 Culture Media
• Anaerobic blood agar
• Cooked meat medium

⚗️ Biochemical Tests
• Catalase (−)

🩺 Disease
• Tetanus

🔬 Lab Findings
• Drumstick bacilli
• Anaerobic growth

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🔴 3. Clostridium perfringens ➤ Anaerobic
➤ Spore forming
➤ Non-motile

🧫 Culture Media
• Blood agar
• Robertson cooked meat medium

⚗️ Biochemical Tests
• Nagler reaction (+)
• Lecithinase (+)

🩺 Disease
• Gas gangrene
• Food poisoning

🔬 Lab Findings
• Double-zone hemolysis

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🔴 4. Corynebacterium diphtheriae ➤ Club-shaped rods
➤ Chinese-letter arrangement
➤ Non-spore forming

🧫 Culture Media
• Loeffler medium
• Tellurite agar

⚗️ Biochemical Tests
• Catalase (+)
• Elek test (+)

🩺 Disease
• Diphtheria

🔬 Lab Findings
• Metachromatic granules
• Black colonies

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🔴 5. Listeria monocytogenes ➤ Small Gram +ve rod
➤ Tumbling motility
➤ Facultative intracellular

🧫 Culture Media
• Blood agar

⚗️ Biochemical Tests
• Catalase (+)
• CAMP test (+)

🩺 Disease
• Listeriosis
• Neonatal meningitis

🔬 Lab Findings
• Narrow beta hemolysis

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🔴 6. Nocardia asteroides ➤ Branching filamentous rods
➤ Weakly acid-fast
➤ Aerobic

🧫 Culture Media
• Sabouraud agar
• Blood agar

⚗️ Biochemical Tests
• Catalase (+)
• Urease (+)

🩺 Disease
• Nocardiosis

🔬 Lab Findings
• Weak acid-fast filaments

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📌 Quick Memory Tips ✅ Bacillus → Aerobic spore former
✅ Clostridium → Anaerobic spore former
✅ Corynebacterium → Chinese letters
✅ Listeria → Tumbling motility
✅ Nocardia → Weak acid-fast

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🧫 BIOCHEMICAL TESTS – COMPLETE QUICK NOTE


🧪 Topic: Identification of Bacteria Using Biochemical Tests
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🔬 1. What are Biochemical Tests?
Biochemical tests are used to identify bacteria based on their metabolic activities (enzyme reactions).
👉 Helps differentiate bacteria that look similar under microscope
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🧬 2. Purpose of Biochemical Tests
✔ Identify unknown bacteria
✔ Differentiate closely related species
✔ Confirm culture results
✔ Assist in diagnosis of infections
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⚗️ 3. Common Biochemical Tests
🔹 Catalase Test
• Detects enzyme catalase
• + → bubbles (O₂ released)
• Example: Staphylococcus (+), Streptococcus (−)
🔹 Oxidase Test
• Detects cytochrome oxidase enzyme
• + → purple color
• Example: Pseudomonas (+)
🔹 Coagulase Test
• Detects clotting enzyme
• + → plasma clot formation
• Example: Staphylococcus aureus (+)
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🧪 4. IMViC Tests (Important ⚠️)
Used mainly for Enterobacteriaceae identification:
🔸 Indole Test
• + → red ring (tryptophan breakdown)
🔸 Methyl Red (MR)
• + → red (acid production)
🔸 Voges-Proskauer (VP)
• + → pink/red (acetoin production)
🔸 Citrate Test
• + → blue color (citrate utilization)
👉 Example:
E. coli → ++−−
Enterobacter → −−++
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🦠 5. Other Important Tests
🔸 Urease Test
• + → pink (urea breakdown)
🔸 TSI Agar (Triple Sugar Iron)
• Tests glucose, lactose, sucrose fermentation
• Also shows gas & H₂S production
🔸 Motility Test
• Determines if bacteria can move
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⚠️ 6. Key Points in Practice
✔ Use pure culture
✔ Follow correct incubation time
✔ Observe color change carefully
✔ Avoid contamination
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📊 7. Clinical Importance
✔ Accurate identification of pathogens
✔ Guides antibiotic selection
✔ Essential in lab diagnosis
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📌 8. Exam Tips & Memory Tricks
✔ Remember IMViC pattern ⚠️
✔ Practice result interpretation
✔ Know examples of bacteria
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✨ Summary:
Biochemical tests are essential tools in microbiology to identify bacteria based on their metabolic properties and support clinical diagnosis.
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