Microbiology SZH Lahore

12/08/2026

Colony count method for urine culture
Step-by-step explanation

Sample collection
A midstream urine sample is collected in a sterile container to avoid contamination.

Inoculation
A calibrated loop (usually 0.001 mL or 0.01 mL) is dipped into the urine and streaked onto an agar plate.

Incubation
The plate is kept in the incubator at 35–37°C for 18–24 hours.

Colony counting
After incubation, the number of colonies on the plate is counted.

Calculation
Each colony represents bacteria from the urine.If a 0.001 mL loop is used → multiply colony count by 1000 to get CFU/mL.
Example: 50 colonies × 1000 = 50,000 CFU/mL.

Interpretation
100,000 CFU/mL (10⁵) → significant infection.

Easy way to rememberThink of it like this:Loop → Plate → Count → Multiply → Interpret.
That’s the whole colony count method in five words.

11/08/2026

Download available!
Oxford Handbook of Infectious Diseases and Microbiology, 2nd Edition.pdf (3.63 MB)
Link in comments

08/08/2026

The bacterial growth curve illustrates the predictable pattern of bacterial multiplication and decline in a closed culture system, reflecting how microbial populations respond to nutrient availability, environmental conditions, and waste accumulation over time.

22/07/2026

🧫🔬 When it comes to ESBLs, understanding the multi-step phenotypic detection workflow and avoiding pitfalls like the 'MDR Piggyback' phenomenon is essential. 💊🛡️

22/07/2026

🧬 Scientists Remove HIV From Human Immune Cells Using CRISPR Gene Editing

A major breakthrough in HIV research has brought scientists closer to a future where the virus may be removed instead of simply controlled.

Researchers have used CRISPR gene-editing technology to cut HIV DNA out of infected human immune cells in the laboratory.

Unlike current HIV treatments, which can stop the virus from multiplying but cannot remove it completely, CRISPR works by targeting the hidden genetic material of HIV that remains inside infected cells.

The idea is simple but revolutionary:

🧬 Find the HIV genetic code hidden inside human cells
✂️ Use CRISPR molecular tools to cut it out
🛡️ Allow healthy immune cells to function without the virus

Scientists say this approach is still experimental and faces major challenges before it can become a treatment for people, including safely reaching every infected cell in the body.

But the discovery shows the growing power of gene editing in medicine.

From cancer therapies to inherited diseases, and now potentially HIV, scientists are exploring ways to not just manage diseases, but rewrite the biology behind them.

The dream of an HIV cure is still ahead, but every breakthrough brings researchers one step closer.

21/07/2026

Nanoparticle synthesis workflow

21/07/2026

Protection against is dangerously low.

Here’s the latest data:

In 2025, 84% of children globally received their first dose of measles vaccine, and just 77% received a second dose.
This is far below the 95% coverage needed to prevent outbreaks. This leaves children at risk worldwide.

Measles is serious and can be fatal.
The prevention? 2 doses of measles vaccine.
Give your children the best protection.

20/07/2026

20/07/2026

E. coli

20/07/2026

🧬 AmpC β-LACTAMASES: The Inducible Enemy! 🦠

​"Inducible today, resistant tomorrow."
​As healthcare professionals and microbiologists, we frequently face complex resistance mechanisms that challenge our standard therapeutic choices. Among the most formidable of these are AmpC β-lactamases—the Class C enzymes that are completely immune to classic inhibitors like Clavulanic acid, Tazobactam, and Sulbactam.

​🧪 ​Stewardship Pearls & Salvage Therapy: Why Cefepime and Carbapenems remain our most reliable allies when facing these pathogens.

​💡 Stewardship Reminder: Avoid using 3rd-generation cephalosporins against known inducible AmpC organisms, even if the initial lab report says "Susceptible"! Always rely on local antibiograms and expert stewardship guidance🔬