A district health officer reports that the Slide Positivity Rate (SPR) for malaria in her district has crossed 5% for three consecutive months. According to NVBDCP operational guidelines, this indicates:

• A Pre-elimination phase — focus only on surveillance
• B Active transmission with need for intensified vector control and case management ✓
• C Epidemic threshold has been crossed — declare outbreak response
• D Acceptable endemic level requiring no specific action

Explanation

SPR (proportion of blood smears positive out of those examined) > 5% indicates moderate-to-high transmission, triggering intensified response including indoor residual spraying, LLIN distribution, active case detection, and enhanced treatment. An SPR of 5% is not the 'epidemic threshold' per se — that is defined by a doubling of cases over previous weeks in outbreak protocols. SPR < 1% is targeted for pre-elimination, and SPR < 0.1% for elimination certification.

Reference: Park's Textbook of Preventive and Social Medicine, 27th ed.

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Written and medically reviewed by the StethoPrep medical team.