# Can a person infected with rubella (German measles) transmit the infection to others even if they show no symptoms? Canonical page: https://clinicsjo.com/en/faq/rubella-transmission-without-symptoms Language: en Category: infectious Publisher: ClinicsJo Published: 2026-09-13T17:52:51.399Z Content updated: 2026-09-13T17:52:51.399Z Translation (ar): https://clinicsjo.com/ar/faq/rubella-transmission-without-symptoms Yes, it is entirely possible for a person infected with the rubella virus (also known as German measles) to transmit the infection to others, even if they do not show any clear symptoms. Medical data indicates that approximately half of the people who contract the rubella virus do not show visible symptoms of the disease, yet they remain capable of spreading the virus to those around them [\[3\]](). The virus is easily transmitted through airborne respiratory droplets produced when an infected person coughs or sneezes [\[1\]](). ## How does the virus spread silently? The deceptive nature of rubella lies in the fact that the infection can spread without the infected person or those around them realizing the disease is present. The virus spreads in the body approximately 5 to 7 days after infection, and symptoms (if they appear) often manifest two to three weeks after initial exposure to the virus. Since many cases are mild or asymptomatic, a person may interact with others without taking necessary precautions, contributing to the continued cycle of transmission within the community [\[1\]](). This makes it very difficult to trace contacts or control the spread of the virus based on symptom monitoring alone. ## Risks of transmission to pregnant women The population most at risk when dealing with an infected person (even without symptoms) is pregnant women who do not have prior immunity. When a pregnant woman is infected with the rubella virus, especially during the first trimester of pregnancy, there is up to a 90% probability that the virus will be transmitted to the fetus [\[1\]](). This transmission carries serious risks, including the possibility of miscarriage, stillbirth, or giving birth to a child with Congenital Rubella Syndrome (CRS), which is associated with permanent health complications such as hearing impairment, congenital heart defects, and eye damage [\[3\]](). For more details on procedures and prevention, you can view the article [Rubella (German Measles): Symptoms, Pregnancy Risks, and Vaccine Prevention (Arabic)](). ## The role of the vaccine in breaking the chain of infection Because the virus often spreads silently, vaccination is the most effective means of protection. The rubella vaccine, which is often given as part of combination vaccines such as the MMR, provides strong, long-term immunity that exceeds 95% effectiveness after just one dose, immunity similar to that which the body acquires after recovering from a natural infection [\[1\]](). As the vaccine is safe and effective, receiving it according to healthcare provider guidelines reduces the likelihood of infection and transmission, and helps protect the community, though it does not provide an absolute guarantee for every individual. In case of doubt regarding exposure to an infected person, one must consult a healthcare provider immediately, especially for pregnant women or those with weakened immune systems, to evaluate the situation and provide necessary medical recommendations [\[2\]](). ## Medical references - [Rubella]() - [Measles, Mumps, Rubella (MMR) Vaccine Safety]() - [Rubella]() General health education; not a substitute for individualized clinical assessment. Citation URL: https://clinicsjo.com/en/faq/rubella-transmission-without-symptoms#answer