Hans,

Do you have PRINCIPLES OF PRESCRIBING by Mathur?
Page 413, "Indications of the Nosodes". What I'm about to quote is essentially the same as what I was taught by Dr. Murphy:
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1. For prophylaxis--Dr. Wheeler recommends that in epidemics, the corresponding nosode in the 30th potency will protect for at least a fortnight. ... For prevention of Smallpox--Variolinum; Whooping Cough--Pertussin; Measles--
Morbillinum; for Diphtheria--Diphtherinum, etc.
***

The chapter goes on to say that the nosode is appropriate when the patient: has not been well since a certain illness, like the flu, whooping cough, etc.;
when the indicated remedy does not act well;
at the beginning of treatment when the symptoms do not point to a specific remedy (as I said above);
the indicated remedy doesn't hold;
when the patient has the picture of the nosode; and
when convalescence is slow.

This is exactly what I was taught, and here it is
in PRINCIPLES OF PRESCRIBING, I can only assume that it must be accepted practice.

Snoopy