RivCo Health Officials Warn Of Monkeypox Case; Urge Residents To Get Vaccinated Ahead Of Travel

RIVERSIDE, CA — Riverside County health officials announced that a resident tested positive for clade I mpox after traveling abroad.

The patient, who had traveled to the Middle East, was no longer contagious at the time they returned to the country, officials said. Health authorities are now urging residents to get vaccinated before international travel, Riverside University Health System Public Health announced Thursday.

The county did not specify which city the person lives in.

It is the second case of mpox, otherwise known as Monkeypox, to be confirmed in the Golden State, and it is the sixth case in the U.S.

“Travel is often a time of connection, exploration and community. If you may engage in intimate contact while traveling, getting vaccinated against mpox is a simple and effective way to protect yourself and others," Riverside County Public Health Officer Dr. Jennifer Chevinsky said. "If you develop a rash or get sick after international travel, it’s important that you talk to your healthcare provider."

Mpoz is a viral disease that is caused by two virus types known as clades. While clade I is traced to the current rise of cases in Central and Eastern Africa, clade I caused higher numbers of serious illnesses than clade II. However, recent outbreaks have been less severe, officials said.

Symptoms between the two clades are similar and include fever, rash, swollen lymph nodes, headaches and malaise. These symptoms generally occur five to 21 days after exposure. Mpox is spread mostly through close, prolonged contact with a person infected with the virus. Contaminated clothing and bedsheets can also spread the virus.

Riverside University Health System Medical Director, Dr. Carlos Calderon, urges open communication with intimate partners about recent international travel, illnesses or rashes.

"It is important to speak candidly with sexual partners and use strategies that reduce the risk of disease," he said.

This year, nine mpox cases, including a clade I case, were reported in Riverside County. That shows a sharp decrease from the staggering 316 cases reported in 2022, when mpox dominated headlines.

The decline is largely thanks to a proactive effort in vaccination outreach. The county has partnered with community-based organizations and healthcare groups to encourage residents to get vaccinated and practice prevention.

Riverside County has accounted for around 5.3 percent of all detected mpox cases in California. Meanwhile, the county has administered about 6.2 percent of the state's total mpox vaccine doses.

The California Department of Public Health (CDPH) updated its mpox vaccination guidance. Travelers to regions with active mpox outbreaks are advised to receive their first vaccine dose at least six weeks before departure, followed by a second dose four weeks later — ensuring the best protection two weeks before travel. The vaccine is effective against both clade I and clade II mpox. For those who have already completed the two-dose series, no additional doses are recommended, according to CDPH.

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