A Smear-Positive Father and a Seven-Month-Old Infant

Why the household is at high risk: a cough of seven weeks with a positive sputum test means Dinesh is discharging TB bacteria in droplet nuclei. These stay suspended in air for hours, so the real risk is shared air in one closed room at night, not the shared glass.

Infant, 7 months: the highest risk. Immunity is immature, and young children progress rapidly from infection to disease, including severe forms such as miliary TB and TB meningitis. BCG given at birth protects mainly against these severe forms; it does not prevent infection. A breastfed infant of a smear-positive mother or father needs urgent screening for symptoms, weight and growth, and a decision on isoniazid preventive therapy after TB is ruled out.

Children aged 8 and 5: also close contacts; they need symptom screening, weight recording and testing as advised by the MO. The under-five group is prioritised for preventive therapy.

Wife: adult contact, so she needs sputum testing even if she has no cough.

Mother (elderly): age and possibly poor nutrition raise her risk of progressing to disease.

Conclusion: contact investigation for all five is a clinical need today, not a matter of waiting for symptoms.

He is not right to stop, but he is not imagining the feet.

Likely cause: burning and tingling in the feet on TB treatment point to peripheral neuropathy, classically caused by isoniazid because it interferes with vitamin B6 (pyridoxine). It is a known, manageable side effect, not a reason to abandon treatment. The correct action is to report it at the PHC so the MO can add pyridoxine and review the dose; never to stop the tablets quietly.

Why stopping is dangerous

• Missed doses let the surviving bacteria regrow, so the cough and infectivity return and treatment drags on.
• Partial treatment selects drug-resistant bacteria, and MDR-TB needs 18-24 months of toxic injections and tablets, costs far more and can be fatal.
• He also becomes infectious to the infant again.

How to fix adherence

• Shift the daily dose to a fixed time that fits work, for example before the morning meal, and take it with food if it causes nausea.
• Use a pill box, a mobile alarm, or a family member as a reminder.
• Ask the PHC about a DOTS provider nearer than 6 km, or a monthly supply where rules allow.
• Treatment is free; the six-kilometre walk should not cost him wages.
• Avoid alcohol, which worsens neuropathy and liver strain.

Air, not utensils, is the route

• Keep the window and the door open at night; cross-ventilation dilutes droplet nuclei. Use a mosquito net or a fan against mosquitoes instead of sealing the room.
• Let sunlight into the room during the day; ultraviolet light kills the bacteria.
• Dinesh should cover his mouth and nose with a cloth or mask while coughing during the first weeks of treatment, and turn his face away from the infant.
• Sputum should be collected in a covered container with a lid, or on paper that is burnt.

Unnecessary measures

• Separate glasses and plates are not required if they are washed with hot soapy water and dried; TB does not spread by sharing food. If a separate glass makes the family comfortable, use it without treating him as untouchable.
• Do not send him away from the house, and do not stop breastfeeding the infant; breastfeeding continues and protects the baby against other infections.

Nutrition

• Extra energy and protein: an additional helping of dal, one or two eggs, milk, groundnuts, seasonal vegetables and fruit, and more fluids. Weight should be checked at every DOTS visit.
• Screen the whole family for undernutrition, since poor weight raises the risk of disease.

Stigma

• Tell neighbours plainly that TB is curable, that after two weeks of regular treatment the risk falls sharply, and that it spreads through the air, not through touch.