GPAtlas🧭 When to suspect
Rubella (German measles) is a mild, self-limiting togavirus infection – but in primary care its entire clinical significance lies in maternal infection during pregnancy, which can cause miscarriage and congenital rubella syndrome (CRS). Following the success of the MMR (measles, mumps and rubella) programme, the UK achieved World Health Organization (WHO) elimination status in 2016, and confirmed rubella is now very rare; most cases are imported, occurring in women born in countries without routine rubella immunisation.
Two facts shape the whole approach. First, antenatal rubella susceptibility screening was withdrawn across the UK on 1 April 2016 – so a "rubella immune" booking result is no longer routinely generated, and (importantly) a negative result would never have protected the current pregnancy anyway. Second, rubella is clinically indistinguishable from parvovirus B19 and several other rash illnesses; the rash is fleeting and non-specific, so clinical diagnosis is unreliable.
The key skills are therefore to maintain suspicion in any pregnant woman with a maculopapular rash, fever, lymphadenopathy (especially sub-occipital and post-auricular) and/or arthralgia; to keep a high index of suspicion in an asymptomatic pregnant woman reporting significant contact with a confirmed or suspected case; and then to test urgently for rubella AND parvovirus B19, notify, and involve the Health Protection Team (HPT) and fetal medicine. Risk to the baby is driven almost entirely by gestation at the time of maternal infection.
| Gestation at maternal infection | Risk to the fetus | Typical features |
|---|---|---|
| Up to 11 weeks | Very high – up to ~90% develop CRS | Multiple defects: sensorineural deafness, congenital heart disease, cataracts, microcephaly |
| 11–16 weeks | High – around 10–20% | Mainly sensorineural deafness, ± retinopathy |
| 16–20 weeks | Low / minimal | Isolated deafness only (rare) |
| After 20 weeks | No reported CRS | Reassure – no recorded cases beyond 20 weeks |
Source: UKHSA Green Book chapter 28 · UKHSA viral rash in pregnancy guidance · UK National Screening Committee
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