Analysis Summary:

The article's core claim about the CDC recommending an additional measles vaccine shot for some domestic travelers is partially supported but lacks specific details and context. While the CDC does provide information on measles vaccination and travel, the provided sources don't explicitly confirm a *new* recommendation for an *additional* shot for *domestic* travel as a general measure. The article exhibits a moderate bias due to the lack of context and potential for misinterpretation.

Detailed Analysis:

• Claim:** "The CDC is now backing an additional measles vaccine shot for some travelers within the United States in response to record outbreaks."
  • Verification Source #1: Mentions a bulletin issued by the agency on April 8 about measles but states it "did not mention the new vaccination recommendations for domestic travel." This contradicts the "now backing" aspect of the claim.
  • Verification Source #2: Discusses MMR vaccine recommendations for travel but focuses on infants and does not specifically mention an *additional* shot for *domestic* travel.
  • Verification Source #3: Focuses on travel to China and mentions measles vaccination recommendations for *international* travel, not domestic.
  • Verification Source #4: States that two doses of the MMR vaccine are recommended, but does not mention an *additional* dose for domestic travel.
  • Verification Source #5: Focuses on travel to Japan and mentions measles vaccination recommendations for *international* travel, not domestic.
  • Internal Knowledge:* It is possible that the CDC has issued specific recommendations for certain localized outbreaks, but this is not explicitly stated or supported by the provided sources. Without further information, it's difficult to assess the accuracy of the claim fully.

Supporting Evidence/Contradictions:

• Verification Source #1: Contradicts the claim that the CDC is "now backing" the recommendation, as the April 8 bulletin did not mention it.
• Verification Source #2, #3, #4, #5: Fail to cover the specific claim of an *additional* measles vaccine shot recommendation for *domestic* travelers. They primarily discuss standard vaccination schedules and international travel.
• Internal Knowledge:* The CDC generally recommends two doses of the MMR vaccine. An additional dose would likely be in response to a specific outbreak or situation, which is not detailed in the article or supported by the provided sources.