You have no sources from the peloton so shut up about what the rumours are.
Every year some team gets sick in some race or another...recall Basso last Giro.
I would point out that it never has happened in a big race in Amercia because the hotels and food service here actually are sanitary. You can read all the riders' comments about how well run the races here are, how great the food and hospitality and accomodations compared with Europe. I recall my first visit to Paris becoming quite ill with food poisoning, when I asked feloow travellers they said yes it happens all to frequently due to the different standards of cleanliness continetal europe operatred under--in contrast to England and Scotland where we travelled extensively with nary a problem in any way.
If you read riders' diaries from the big tours, the one common theme regardless of nationality is the lousy substandard food, the crappysmall poorly airconditioned hotels, and the risk of food poisoning or spoiled eggs, salmonella salad etc etc, Its really a disgrace.
This never happens to soccer teams in the world cup, or needless to say the Ny Yankees or Chicago Bulls. European cycling lives in a different era or century or something. A players union that was strong would do a lot to eliminate this very unnecessary threat to riders' health.