Salmonellosis is an infection caused by bacteria of the Salmonella species primarily spread through fecal-oral transmission. This results in the spread of infection through contaminated food, excretions from sick animals or people, and contaminated surface water.
There are documented cases of human salmonellosis caused by the consumption of milk contaminated with Salmonlla typhimurium or Salmonella dublin. However, Food Standards Australia New Zealand reports that Salmonella spp. infections are not transmitted to humans through the milk itself, but rather through environmental contamination (p. 14).
- Salmonella, Listeria, E. Coli and Mycobacterium paratuberculosis in Milk: Is there Cause for Concern? - University of Wisconsin - Madison
- Salmonella Typhimurium Infection Associated with Raw Milk and Cheese Consumption - Centers for Disease Control
Strep throat and scarlet fever are caused by Group A Streptococcus, or Streptococcus pyogenes.
Mastitis (infection of the udder) in goats can be caused by Group B and Group C Streptococcus, among others. The University of Alabama and the University of Florida both provide good bulletins on the topic.
According to the Public Health Agency of Canada and Dr. Christopher Olsen at the University Wisconsin Madison School of Veterinary Medicine there is no significant risk of transmission of Group B Streptococcus from livestock to humans. However, there have been documented cases of people developing Group C Streptococcus infections following the consumption of raw milk.
You might also consider sending a milk sample to a lab for analysis. Udder Health Systems has labs in Washington and Idaho and one of their specialists can provide guidance on what tests to choose and how to submit a sample.