|
|
|
|
front |1 |2 |3 |4 |5 |6 |7 |8 |9 |10 |11 |12 |13 |14 |15 |16 |17 |18 |19 |20 |21 |22 |23 |24 |25 |review |
 |
Plotting the cases geographically
(by residence, school or job) may show evidence of clustering.
Checking the age and sex may aid in determining a common denominator (ii.e. baby food causing disease in babies, their mothers (by tasting) and elderly (using baby food for dental or economic reasons). |