From the Journals

Rubella, Parvovirus Infections Studied in RA

A large real-world analysis shows how often acute rubella and parvovirus B19 infections trigger rheumatoid arthritis workups—and where diagnostic confusion is most likely.

by Doug Brunk
January 12, 2026
3 min

Conexiant

1

1% of adults tested positive for rubella IgM.
2

Higher rates of arthritis-related diagnostic codes in IgM-positive adults.
3

Rubella IgM positivity did not predict future RA diagnosis.
4

1% tested positive for parvovirus B19 IgM.
5

B19V IgM positivity linked to a 33% higher risk of future RA suspicion.
6

Patients with prolonged B19V symptoms show no joint erosion like RA.
7

B19V IgM testing needed during acute illness for accurate diagnosis.

Original Source(s)

Conexiant

Rubella, Parvovirus Infections Studied in RA

A large real-world analysis shows how often acute rubella and parvovirus B19 infections trigger rheumatoid arthritis workups—and where diagnostic confusion is most likely.