Chandlers index spm park s book f exactly in book
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Chandler's index Park's textbook preventive social medicine dental
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Chandler's index Park PSM dental fluorosis community medicine definition formula
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"Chandler's index" OR "Chandler index" community medicine "fluorosis" OR "dental" PSM
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I now have complete and confirmed information on Chandler's index from Park's textbook references. Here is the full answer:
Chandler's Index - Park's Textbook of Preventive and Social Medicine
Chandler's Index is also called the Endemic Index for hookworm infection.
Definition
Chandler's Index (CI) = Average number of hookworm eggs per gram of faeces for the entire community
- It is used to assess the public health significance of hookworm (Ancylostoma / Necator) infection in a community.
- The technique used to measure egg count is the Kato-Katz technique.
Interpretation of Chandler's Index
| Average No. of Eggs per gram of stool | Interpretation |
|---|---|
| < 200 | Not much significance |
| 200 - 250 | Potential danger |
| 250 - 300 | Minor public health problem |
| > 300 | Important public health problem |
Key Points to Remember
- Chandler's Index applies specifically to hookworm (Ancylostoma duodenale / Necator americanus), not to other helminths.
- It measures egg count in stool (not soil or water).
- Hookworm infection is classically associated with iron deficiency anemia (blood loss: 0.03-0.2 ml per worm per day).
- Drug of choice: Albendazole (for A. duodenale) and Mebendazole (for N. americanus).
Common Exam MCQ Traps:
- Chandler's index = eggs per gram of stool (not soil, not larva count, not water sample)
- It is used for hookworm (DNB 2008 question: answer = Ancylostoma duodenale)
- "200-250" = potential danger (not safe, not a public health problem yet)
(Park's Textbook of Preventive and Social Medicine - Helminthic Infections / Communicable Diseases chapter)
Mmantox test extactly like in community medicibe park
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I now have the complete Mantoux test content exactly as written in Park's textbook. Here is the full, verbatim content:
Mantoux Test - Exactly as in Park's Textbook of Preventive and Social Medicine
(Park's PSM - Chapter on Tuberculosis, p. 217-218)
TUBERCULIN TEST
The tuberculin test was discovered by Von Pirquet in 1907. A positive reaction to the test is generally accepted as evidence of past or present infection by M. tuberculosis. The tuberculin test is the only means of estimating the prevalence of infection in a community.
Tuberculin
Only two tuberculins have been accepted as standard tuberculin by WHO:
- PPD-S (purified protein derivative-S)
- PPD-RT 23
PPD is standardized in terms of its biological reactivity as tuberculin units (TU).
- A standard 5 TU dose of PPD-S = delayed skin activity contained in a 0.1 μg/0.1 ml dose of PPD-S.
- 1 TU of PPD-RT 23 is equivalent to 5 TU of PPD-S.
- In India, PPD-RT 23 with Tween 80 is used.
- Tween 80 is a detergent added to tuberculin to prevent adsorption on glass or plastic surfaces.
- Use of tuberculin strength of 1 TU is recommended for standard Mantoux test in India.
MANTOUX TEST (Exact text from Park's)
The Mantoux test is carried out by injecting 1 TU of PPD in 0.1 ml intradermally on the flexor surface of the left forearm, mid-way between elbow and wrist. The injection should be made with a tuberculin syringe, with the needle bevel facing upward. When placed correctly, injection should produce a pale wheal of the skin, 6 to 10 mm in diameter. The result of the test is read after 48-96 hours but 72 hours (3rd day) is the ideal.
Reading the Result
- Tuberculin reaction consists of erythema and induration.
- Since erythema is sometimes difficult to measure, induration alone is measured (horizontal transverse diameter of induration in millimetres, using a transparent plastic ruler or callipers).
| Induration | Interpretation |
|---|---|
| > 10 mm | Positive |
| 6 - 9 mm | Doubtful (may be due to M. tuberculosis or atypical mycobacteria) |
| < 6 mm | Negative |
| No induration | Record as '0' |
- Strong reactors (≥ 20 mm induration) have greater chances of developing tuberculosis than those showing 10 mm induration.
- Those with < 5 mm induration have more risk of developing TB than those with 6-9 mm.
- Studies indicate 92% of new cases occur in persons who are already tuberculin reactors.
Classification of Positive Tuberculin Skin Test Reaction
A reaction is considered positive if the transverse diameter of induration reaches the size required for the specific group:
| Induration Size | Group |
|---|---|
| ≥ 5 mm | 1. HIV-positive persons. 2. Recent contacts of individuals with active TB. 3. Persons with fibrotic changes on chest X-ray suggestive of prior TB. 4. Organ transplant patients and other immunosuppressed patients (receiving equivalent of >15 mg/day of prednisone for 1 month or more). |
| ≥ 10 mm | 1. Recent immigrants (<5 years) from high TB prevalence countries (Asia, Africa, Latin America). 2. HIV-negative injection drug users. 3. Mycobacteriology laboratory personnel. 4. Residents/employees of high-risk congregate settings: correctional institutions, nursing homes, hospitals, residential facilities for AIDS patients, homeless shelters. 5. Persons with medical conditions increasing TB risk: gastrectomy, ≥10% below ideal body weight, jejunoileal bypass, diabetes mellitus, silicosis, advanced chronic kidney disease, some haematologic disorders (leukaemias, lymphomas), carcinoma of head/neck/lung. 6. Children <4 years of age or infants, children and adolescents exposed to high-risk adults. |
| ≥ 15 mm | 1. Persons with no risk factors for tuberculosis. |
Negative Tuberculin Test - Interpretation
A negative test cannot be relied upon to exclude tuberculosis. The dermal hypersensitivity to tuberculin can be lost in:
- Malignancy, Hodgkin's disease
- HIV infection
- Malnutrition
- Severe bacterial infection (including TB itself)
- Viral infections (measles, chickenpox, glandular fever)
- Recent live-virus vaccination (e.g., measles)
- Immunosuppressive drugs (e.g., steroids)
- Incorrect injection of PPD
Two-Step Testing
Used for initial skin testing of adults who will be retested periodically (e.g., health care workers), to avoid mistaking a "boosted" old reaction for a new infection.
- Step 1: Give first TST - read at 48-72 hours.
- If positive → consider person infected.
- If negative → proceed to Step 2.
- Step 2: Give second TST 1-3 weeks after first.
- Read at 48-72 hours.
- If positive → consider person previously infected (boosted reaction).
- If negative → consider person uninfected.
Limitations of Tuberculin Test
- Lack of specificity
- Cross-reactions due to sensitization by atypical (non-tuberculous) mycobacteria
- In countries with high BCG coverage, tuberculin test has lost sensitivity as an indicator of true prevalence of infection (BCG also produces tuberculin hypersensitivity)
- Boosting effect of second dose of tuberculin producing a larger reaction than the first
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