Medical Lab Technologist

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Bacillary Dysentery vs Amoebic Dysentery
17/05/2026

Bacillary Dysentery vs Amoebic Dysentery

🩸 Giemsa Stain in HematologyGiemsa stain is a Romanowsky stain commonly used in hematology and parasitology for staining...
17/05/2026

🩸 Giemsa Stain in Hematology

Giemsa stain is a Romanowsky stain commonly used in hematology and parasitology for staining:

* Blood smears
* Bone marrow smears
* Blood parasites

It helps visualize:
✅ Blood cells
✅ Nuclear details
✅ Cytoplasm
✅ Hemoparasites

⸻

🔬 Principle of Giemsa Stain

Giemsa stain contains:

* Methylene blue
* Azure dyes
* Eosin

These dyes bind differently to acidic and basic components of cells.

🧫 Anaerobic Culture Methods
15/05/2026

🧫 Anaerobic Culture Methods

BSL (Biosafety Level) in LaboratoryBSL means Biosafety Level — a system used to classify laboratories according to the r...
15/05/2026

BSL (Biosafety Level) in Laboratory

BSL means Biosafety Level — a system used to classify laboratories according to the risk of infectious microorganisms handled inside them.

It tells:

* 🔬 How dangerous the organism is
* 🧤 What safety equipment is needed
* 🚪 What containment precautions are required

🦠 Hantavirus Pulmonary Syndrome is a zoonotic viral disease caused by Hantaviruses belonging to family:📚 Classification*...
14/05/2026

🦠 Hantavirus Pulmonary Syndrome is a zoonotic viral disease caused by Hantaviruses belonging to family:

📚 Classification

* Family: Hantaviridae
* Genus: Orthohantavirus
* Type: RNA virus

Important species:

* Hantaan virus
* Sin Nombre virus
* Seoul virus

⸻

🔬 Morphology of Hantavirus

🧫 Structure

* Shape: Spherical / pleomorphic
* Size: ~80–120 nm
* Envelope: Present ✅
* Genome: Single-stranded negative-sense RNA

🧬 Genome Segments

The virus contains 3 RNA segments:

Segment Function
L segment RNA polymerase
M segment Glycoproteins
S segment Nucleocapsid protein

⸻

🖼️ Morphology Diagram

⸻

🐀 Reservoir Host

Main reservoir:

* Rodents 🐀

Examples:

* Rats
* Mice
* Deer mice

The virus remains in rodents without causing disease.

⸻

🚨 Mode of Transmission

1️⃣ Aerosol Inhalation (Most Common)

Humans inhale:

* Rodent urine
* Saliva
* F***s particles

This is the major transmission route.

⸻

2️⃣ Rodent Bite

Rarely transmitted by infected rodent bite.

⸻

3️⃣ Contaminated Food

Food contaminated with rodent excreta may spread infection.

⸻

4️⃣ Person-to-Person

Usually absent ❌
Rarely reported with some South American strains.

⸻

🔄 Transmission Cycle

Rodent → Urine/F***s/Saliva → Airborne particles → Human inhalation

⸻

🫁 Diseases Caused

1. Hantavirus Pulmonary Syndrome (HPS)

* Severe lung infection
* Respiratory distress
* High mortality

2. Hemorrhagic Fever with Renal Syndrome (HFRS)

* Kidney involvement
* Hemorrhage
* Fever

⸻

⚠️ Symptoms

* Fever
* Muscle pain
* Headache
* Cough
* Breathlessness
* Kidney dysfunction

⸻

🧪 Diagnosis

* ELISA
* PCR
* Serology

⸻

💊 Prevention

✅ Rodent control
✅ Avoid rodent-infested areas
✅ Use masks while cleaning closed dusty areas
✅ Proper sanitation

⸻

🧠 Quick Memory Trick

“HANTA = Hidden Airborne rodent Transmission Attack”

* H → Hidden in rodents
* A → Airborne spread
* N → Negative-sense RNA
* T → Three RNA segments
* A → Acute pulmonary syndrome

The E-test (Epsilometer test) is a laboratory method used to determine the Minimum Inhibitory Concentration (MIC) of an ...
13/05/2026

The E-test (Epsilometer test) is a laboratory method used to determine the Minimum Inhibitory Concentration (MIC) of an antibiotic against a microorganism. It helps identify how sensitive or resistant bacteria are to specific antibiotics.

Principle

A plastic strip containing a gradient concentration of antibiotic is placed on an agar plate inoculated with bacteria.
After incubation, an elliptical zone of inhibition forms around the strip.
The point where the ellipse intersects the strip indicates the MIC value.

Procedure

1. Prepare bacterial lawn culture on Mueller-Hinton agar.
2. Place E-test strip on agar surface.
3. Incubate at 35–37°C for 18–24 hours.
4. Observe elliptical inhibition zone.
5. Read MIC where ellipse cuts the scale on strip.

Interpretation

* Lower MIC → organism is more sensitive.
* Higher MIC → organism is more resistant.

Advantages

* Gives exact MIC value.
* Easy to perform.
* Useful for fastidious organisms.

Disadvantages

* Expensive compared to disk diffusion.
* Requires proper storage of strips.

Uses

* Antibiotic susceptibility testing
* Detecting resistant organisms
* Choosing effective antibiotic therapy

Overview of Leukaemia
12/05/2026

Overview of Leukaemia

complete overview of the human immune system.
12/05/2026

complete overview of the human immune system.
















Biochemical Tests in Microbiology: Turning Reactions into Diagnosis...In the world of microbiology, identification is no...
12/05/2026

Biochemical Tests in Microbiology: Turning Reactions into Diagnosis...
In the world of microbiology, identification is not just about observing bacteria - it's about understanding their biochemical reactions
From a simple color change to bubble formation, each test reveals a hidden story about the organism. Whether it's Catalase, Oxidase, Indole, Urease, Citrate, MR-VP, or Coagulase, these tests act like diagnostic clues that quide us toward the correct identification.
◦ Why are these tests so important?
• Help differentiate closelv related bacteria w Provide quick and reliable results
• Essential for routine laboratory diagnosis + Support accurate and timely treatment decisions
Every positive or negative result is not iust a reaction - it's a step closer to the final diagnosis,

2 In microbiology, even the smallest reaction can make the biggest difference
Observe.


11/05/2026

Dermatobia hominis is an obligate parasitic fly whose larval stage (maggot) causes cutaneous myiasis in humans and animals.
Common name
Human botfly
Disease caused
Myiasis = infestation of living tissue by fly larvae.
Geographic distribution
Found mainly in:
Mexico
Brazil
Central and South America
Mode of transmission
The female botfly does not directly deposit eggs on humans.
Instead, it attaches eggs to blood-sucking insects such as:
mosquitoes,
ticks,
flies.
When the carrier insect bites a person, body heat triggers egg hatching, and larvae pe*****te the skin.
Clinical features
Typical findings:
Painful boil-like swelling (furuncular lesion)
Sensation of movement
Central pore/opening for breathing
Serous discharge
Itching and inflammation
Diagnosis
Clinical appearance
Observation of breathing pore
Extraction of larva.











Agar is kept in a slant position to make an agar slant.Reasons for keeping agar in slant positionIncreases surface areaS...
11/05/2026

Agar is kept in a slant position to make an agar slant.
Reasons for keeping agar in slant position
Increases surface area
Slanting gives a larger surface for bacterial growth compared to a straight tube.
Better growth and maintenance
Useful for maintaining pure cultures for longer periods.
Prevents drying
The deep butt of agar retains moisture.
Easy storage and handling
Slant tubes are compact, less likely to spill, and easier to transport.
Useful in biochemical tests
Some tests need both aerobic surface growth and anaerobic deep growth, such as:
TSI agar
Kligler iron agar

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