Organon §101

The symptom complex of an epidemic disease only comes to light through the observation of several cases involving different bodily constitutions. 

It may well be that the physician does not get a perception of the complete image of the epidemic disease with the first case he encounters since each such collective disease only brings the complex of its symptoms to the light of day with the closer observation of several cases. Meanwhile, the carefully investigating physician can often come so close to the true state, even with the first or second patient, that he becomes alive to the characteristic image of the disease, and then finds a fitting, homeopathically commensurate remedy for it.