What type of blood group?

What you have seen from above picture?

S .aurs on blood agar

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‼️Hybridoma

A hybridoma is a type of cell that is created by fusing a specific type of immune cell (usually a B lymphocyte) with a myeloma (cancer) cell. This process allows for the production of monoclonal antibodies, which are identical antibodies that can specifically target a particular antigen.

Key Points about Hybridomas:

1. Creation: Hybridomas are formed through a process called hybridization, where the B cell (which produces antibodies) is fused with a myeloma cell (which can divide indefinitely). This fusion is often facilitated by polyethylene glycol (PEG) or electrical pulses.

2. Monoclonal Antibodies: The primary purpose of creating hybridomas is to produce monoclonal antibodies. These antibodies have many applications in research, diagnostics, and therapeutics.

3. Selection: After fusion, the resulting hybrid cells are screened to identify those that produce the desired antibody. Only the hybridomas that produce the specific antibody are selected for further culture.

4. Applications:

   • Diagnostic Tests: Monoclonal antibodies produced by hybridomas are used in various diagnostic tests, including pregnancy tests and tests for infectious diseases.

   • Therapeutics: They are also used in treatments for conditions such as cancer, autoimmune diseases, and more, as they can specifically target disease-related antigens.

   • Research: In research, monoclonal antibodies are valuable tools for studying proteins and other biomolecules.

5. Advantages: The main advantage of using hybridomas is that they produce large quantities of identical antibodies, which ensures consistency and specificity in experiments and treatments.

6. Limitations: While hybridomas are powerful tools, there can be challenges such as the potential for the hybridoma cells to lose their ability to produce the desired antibody over time.


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✍️HAT or 👇 Hypoxanthine-Aminopterin-Thymidine. It is a selective medium used in the process of hybridoma technology to facilitate the selection of hybridoma cells that produce monoclonal antibodies.

Components of HAT Medium:👇

1. Hypoxanthine: A purine base that is a precursor in the synthesis of nucleotides.

2. Aminopterin: A folic acid antagonist that inhibits the enzyme dihydrofolate reductase, blocking the synthesis of DNA.

3. Thymidine: A pyrimidine nucleoside that serves as a building block for DNA.

✍️Role in Hybridoma Selection:

• Selective Pressure: When B cells (which can produce antibodies) are fused with myeloma cells (which can proliferate indefinitely), not all hybrid cells will survive in culture. Myeloma cells often have mutations that make them unable to synthesize nucleotides, while normal B cells cannot replicate indefinitely.

 
✍️• HAT Medium Function:

  • The presence of aminopterin prevents the growth of unfused myeloma cells because they cannot synthesize nucleotides without external sources.

  • Hypoxanthine and thymidine provide the necessary components for the hybrid cells to survive and proliferate since they can utilize these precursors for DNA synthesis.

✍️ Selection Process:

  • Only hybridoma cells that have successfully fused (which combine the properties of both parent cell types) can grow in HAT medium. These hybridomas can utilize hypoxanthine and thymidine to bypass the block caused by aminopterin, allowing them to replicate and produce monoclonal antibodies.

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WIDAL TEST
is a serological test used to diagnose typhoid fever and other enteric fevers caused by Salmonella bacteria, particularly Salmonella Typhi and Salmonella Paratyphi. The test detects the presence of specific antibodies (agglutinins) in the patient's serum against these bacteria. Here are the general steps involved in performing the Widal test:

▎Materials Needed:

• Patient serum sample

• Widal test kit (containing antigen suspensions for O and H antigens)

• Glass slides or test tubes

• Pipettes

• Incubator (if required)

• Control sera (positive and negative)

▎Steps for Conducting the Widal Test:

1. Sample Collection:

• Collect a blood sample from the patient, preferably during the first week of illness.

• Allow the blood to clot, then centrifuge to obtain serum.

2. Preparation of Serum:

• Dilute the serum sample if necessary, usually in a saline solution or as specified in the kit instructions.

3. Antigen Preparation:

• Prepare the antigen suspensions according to the manufacturer's instructions. The common antigens used are:

• O Antigen: somatic antigen (e.g., O9 for S. Typhi)

• H Antigen: flagellar antigen (e.g., H antigen for S. Typhi)

4. Performing the Test:

• Slide Agglutination Method:

• Place a drop of each antigen (O and H) on separate sections of a clean glass slide.

• Add a drop of diluted serum to each antigen drop.

• Mix gently with a wooden stick or pipette.

• Observe for agglutination (clumping) after about 1-2 minutes.

• Tube Method (if applicable):

• In test tubes, add 1 mL of saline to each tube.

• Add 0.5 mL of serum to each tube.

• Add 0.5 mL of the specific antigen to each tube.

• Mix well and incubate at 37°C for 18-24 hours.

• After incubation, check for agglutination.

5. Interpreting Results:

• A positive result is indicated by visible agglutination.

• The titer (the highest dilution showing agglutination) is noted.

• Generally, a titer of 1:160 or higher for O antigen or 1:320 or higher for H antigen may suggest active infection, but results must be interpreted in conjunction with clinical findings.

6. Confirmatory Testing:

• The Widal test is not solely definitive; it should be confirmed with additional tests and clinical correlation since false positives and negatives can occur.

7. Reporting:

• Document and report the results, including any relevant clinical information.

▎Important Considerations:

• The Widal test has limitations, including cross-reactivity with other infections and varying sensitivity and specificity.

• It is important to consider the patient's clinical history and other diagnostic tests when interpreting results.

Parasitology ppt