Diagnosis and Treatment of AIDS

Laboratory Diagnosis of AIDS

• Detection of Antibodies via ELISA

  • The primary method for screening involves detecting antibodies in the patient's circulation using the ELISA technique.
  • It is noted that while effective, there remains a slight chance for false-positive results when using this method alone.

• Western Blot Analysis

  • This is characterized as a more specific test for identifying HIV antibodies compared to ELISA.
  • The procedure involves analyzing antibodies against $6$ different components of the virus.
  • The Western blot analysis is specifically employed to confirm diagnosis in patients who have already tested positive via ELISA.

• T-Helper Cell Count Monitoring

  • A critical marker for AIDS is the reduction in the T-Helper cell count.
  • The normal physiological level for T-Helper cells is established as $>400/\text{cmm}$.
  • In cases of AIDS, the concentration of these cells is consistently found to be $<300\,\text{cmm}$.

• Polymerase Chain Reaction (PCR) Testing

  • PCR technology is utilized to detect the specific presence of HIV genes within peripheral blood lymphocytes.
  • This method allows for the estimation of the total number of HIV particles present in the blood.

Management of AIDS: Antiretroviral Therapy (ART)

• Reverse Transcriptase (RT) Inhibitors

  • Nucleoside Analogues (NRTIs): This category includes drugs such as AZT ($\text{Zidovudine}$), $\text{Abacavir}$, $\text{Stavudine}$, $\text{Lamivudine}$, and $\text{Zalcitabine}$.
  • Non-Nucleoside Analogues (NNRTIs): Examples within this class include $\text{Loviridine}$, $\text{Nevirapine}$, and $\text{Delavirdine}$.

• Protease Inhibitors

  • These drugs are designed to block the protease enzyme. Specific examples provided are $\text{Indinavir}$, $\text{Ritonavir}$, and $\text{Nelfinavir}$.

• Highly Active Anti Retroviral Therapy (HAART)

  • This involves the professional combination of multiple drugs to suppress the virus effectively.
  • Reference code associated with this therapy: GX622.

Prevention and Public Safety Protocols

• Public Education

  • The primary strategy for prevention is the use of public education and awareness campaigns to limit the overall spread of HIV infection.

• Infection Control and Behavioral Measures

  • Avoidance of extra-marital relationships is cited as a method to limit viral transmission.
  • All blood samples must undergo mandatory testing for HIV before being used in blood transfusions.

• Needle and Syringe Safety

  • All syringes and needles must be properly sterilized before use.
  • The protocol mandates the use of disposable syringes and needles, which must be destroyed immediately following their use.

Sterilization and Decontamination Procedures

• Heat-Based Sterilization

  • Boiling: Subjecting the virus to boiling water for a duration of $10\,\text{minutes}$ is sufficient to inactivate it.
  • Autoclaving: Ordinary autoclaving at a temperature of $120\,^{\circ}\text{C}$ for a duration of $20\,\text{minutes}$ is required for the effective sterilization of medical instruments and gloves.

• Chemical Decontamination

  • Heat-Sensitive Instruments: Instruments that cannot withstand high heat must be decontaminated by immersing them in a $2\%\,\text{glutaraldehyde}$ solution.
  • Management of Blood Spills: Any spills of blood should be washed and neutralized using a $1\%\,\text{sodium hypochlorite}$ solution maintained at $10,000\,\text{ppm}$ chlorine.