Health and Me

Ishita Roy

A Severe Mpox Strain Is Spreading in the US, Here’s What You Need to Know to Stay Safe

Health officials in the United States have raised alarms after confirming cases of a more severe <span><a href="https://www.healthandme.com/health/mpox">mpox</a></span> strain, known as Clade I, in California. This marks the first reported instance of this strain spreading locally, as previous US cases had all been linked to international travel.

So far, three cases have been confirmed across Southern California, including Los Angeles County and Long Beach. All patients required hospitalization but are now recovering at home. The discovery has triggered concern among health experts as Clade I mpox is known to cause more serious illness than the milder Clade II strain that led to the 2022 global outbreak.

Mpox (formerly called monkeypox) is caused by a virus from the same family as smallpox. There are two main genetic variants or clades that infect humans, Clade I and Clade II.

While Clade II was responsible for the global outbreak in 2022–23, Clade I has historically circulated in parts of central and western Africa. It is associated with more severe disease, higher rates of complications, and in some cases, fatalities, particularly among children, pregnant women, and people with weakened immune systems.

Experts are now investigating how this strain might have started circulating within US borders and whether community transmission is occurring.

<h2>Early Signs and Symptoms to Watch For</h2>

Mpox usually begins with flu-like symptoms and can be easily mistaken for a seasonal illness in its early stages. Common early signs include:

<ul><li>Fever, chills, or sweating</li><li>Headache and muscle aches</li><li>Fatigue or weakness</li><li>Swollen lymph nodes</li><li>Sore throat or nasal congestion</li></ul>

Within a few days, a distinctive rash develops, starting as red spots that progress into fluid-filled blisters or pustules. These can appear on the face, palms, soles, genitals, or even inside the mouth and eyes. The rash typically scabs over and heals within two to four weeks.

In more severe Clade I infections, complications may include secondary bacterial infections, prolonged healing, scarring, eye involvement leading to blindness, or inflammation of internal organs. In rare cases, systemic infection can occur, posing life-threatening risks.

Certain groups are more likely to contract or develop severe mpox:

<ul><li>Those in close, intimate, or prolonged contact with an infected person</li><li>Individuals who share contaminated clothing, bedding, or surfaces</li><li>People exposed to respiratory droplets through face-to-face interaction</li><li>Individuals with multiple sexual partners or exposure in commercial sexual venues</li><li>People with compromised immunity, such as those living with HIV, cancer, or transplant recipients</li></ul>

Public health experts emphasize that awareness of symptoms and early diagnosis are key to preventing further spread.

While most mpox cases are not fatal, Clade I poses a higher risk, making prevention critical. Health agencies recommend the following:

<ul><li>Avoid direct contact with people who have rashes or lesions resembling mpox.</li><li>Do not share personal items like towels, bedding, or clothing.</li><li>Practice good hand hygiene, wash hands often with soap and water or use an alcohol-based sanitizer.</li><li>Use masks in crowded or high-risk settings where close contact occurs.</li><li>Seek medical attention immediately if you notice suspicious rashes or flu-like symptoms after possible exposure.</li></ul>

Experts also stress that vaccines used during the 2022 outbreak, such as Jynneos, remain effective against both Clade I and Clade II strains. Vaccination, combined with early treatment and isolation of confirmed cases, is expected to play a crucial role in containing the spread.

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Health officials in the United States have raised alarms after confirming cases of a more severe mpox strain, known as Clade I, in California. This marks the first reported instance of this strain spreading locally, as previous US cases had all been linked to international travel.So far, three cases have been confirmed across Southern California, including Los Angeles County and Long Beach. All patients required hospitalization but are now recovering at home. The discovery has triggered concern among health experts as Clade I mpox is known to cause more serious illness than the milder Clade II strain that led to the 2022 global outbreak.What Is Clade I Mpox?Mpox (formerly called monkeypox) is caused by a virus from the same family as smallpox. There are two main genetic variants or clades that infect humans, Clade I and Clade II.While Clade II was responsible for the global outbreak in 2022–23, Clade I has historically circulated in parts of central and western Africa. It is associated with more severe disease, higher rates of complications, and in some cases, fatalities, particularly among children, pregnant women, and people with weakened immune systems.Experts are now investigating how this strain might have started circulating within US borders and whether community transmission is occurring.Early Signs and Symptoms to Watch ForMpox usually begins with flu-like symptoms and can be easily mistaken for a seasonal illness in its early stages. Common early signs include:Fever, chills, or sweatingHeadache and muscle achesFatigue or weaknessSwollen lymph nodesSore throat or nasal congestionWithin a few days, a distinctive rash develops, starting as red spots that progress into fluid-filled blisters or pustules. These can appear on the face, palms, soles, genitals, or even inside the mouth and eyes. The rash typically scabs over and heals within two to four weeks.In more severe Clade I infections, complications may include secondary bacterial infections, prolonged healing, scarring, eye involvement leading to blindness, or inflammation of internal organs. In rare cases, systemic infection can occur, posing life-threatening risks.Who Is Most at Risk?Certain groups are more likely to contract or develop severe mpox:Those in close, intimate, or prolonged contact with an infected personIndividuals who share contaminated clothing, bedding, or surfacesPeople exposed to respiratory droplets through face-to-face interactionIndividuals with multiple sexual partners or exposure in commercial sexual venuesPeople with compromised immunity, such as those living with HIV, cancer, or transplant recipientsChildren and pregnant womenPublic health experts emphasize that awareness of symptoms and early diagnosis are key to preventing further spread.How to Stay SafeWhile most mpox cases are not fatal, Clade I poses a higher risk, making prevention critical. Health agencies recommend the following:Avoid direct contact with people who have rashes or lesions resembling mpox.Do not share personal items like towels, bedding, or clothing.Practice good hand hygiene, wash hands often with soap and water or use an alcohol-based sanitizer.Use masks in crowded or high-risk settings where close contact occurs.Seek medical attention immediately if you notice suspicious rashes or flu-like symptoms after possible exposure.Experts also stress that vaccines used during the 2022 outbreak, such as Jynneos, remain effective against both Clade I and Clade II strains. Vaccination, combined with early treatment and isolation of confirmed cases, is expected to play a crucial role in containing the spread.