LOS ANGELES (AP) - The Centers for Disease Control says that 172 people on a cruise ship arriving in California Sunday have fallen ill with the highly contagious norovirus during a nearly month-long trip.The Crown Princess has more than 4,100 people on board and will be greeted by CDC staff upon arrival in in San Pedro who will do testing and evaluate the response.In April, 129 people on the same ship contracted norovirus during a seven-day cruise off the California coast.Princess Cruises did not immediately provide comment.The CDC says the cruise line is consulting with them to ensure the ship is sanitized and disinfected before it's used for another trip Sunday.Norovirus symptoms include vomiting, diarrhea, fever and body aches.