Table 1. Modified Faine's criteria.
| Part A: Clinical Data | Score |
| Headache | 2 |
| Fever | 2 |
| If fever, temperature 39°C or more | 2 |
| Conjunctival suffusion (bilateral) | 4 |
| Meningism | 4 |
| Muscle pain (especially calf muscle) | 4 |
| Conjunctival suffusion+Meningism+Muscle pain | 10 |
| Jaundice | 1 |
| Albuminuria or nitrogen retention | 2 |
| Part B: Epidemiological Factors | Score |
| Rainfall | 5 |
| Contact with contaminated environment | 4 |
| Animal contact | 1 |
| Part C: Bacteriological and Laboratory Findings | |
| Isolation of Leptospira on culture | Diagnosis certain |
| Positive serology | |
| ELISA IgM positive*; SAT positive*; MAT single high titre* (Any one of the three tests should be scored) | 15 |
| MAT rising titre (paired sera) | 25 |
A presumptive diagnosis of leptospirosis may be made if: (i) Score of Part A+Part B = 26 or more (Part C laboratory report is usually not available before fifth day of illness; thus it is mainly a clinical and epidemiologic diagnosis during early part of disease) or Part A+Part B+Part C≥25.
A score between 20 and 25: Suggests a possible but unconfirmed diagnosis of leptospirosis.