A Strain of Multidrug-Resistant Salmonella Newport in Mexico

Warning - Level 3, Avoid Nonessential Travel
Alert - Level 2, Practice Enhanced Precautions
Watch - Level 1, Practice Usual Precautions

Key points

  • Some travelers who have spent time in Mexico have been infected with multidrug-resistant (MDR) Salmonella Newport.
    • MDR Salmonella has developed the ability to defeat drugs designed to kill them. Infections with MDR Salmonella can be difficult to treat.
    • Clinicians should follow CDC’s treatment guidance.
  • Many travelers with MDR Salmonella Newport infections reported eating beef, cheese (including queso fresco and Oaxaca), beef jerky, or dried beef (carne seca) before they got sick.

What can travelers do to prevent Salmonella infection?

Traveler Information

Clinician Information

map of Mexico
Map: Mexico (see larger map)
What is Salmonella?

Salmonella are bacteria (germs) that can make people sick. Salmonella can be found in a variety of foods.

Most people with a Salmonella infection (food poisoning) have diarrhea, fever, and stomach cramps. Symptoms usually start 6 hours to 6 days after swallowing the bacteria and usually last 4 to 7 days.

Most people recover without antibiotics. However, some groups of people are more likely to get seriously ill and need antibiotic treatment. These groups include children younger than 12 months (especially those younger than 3 months), people with weakened immune systems, and people who are 65 years or older.