Clinical exacerbations of multiple sclerosis associated with URTI and with serological rise in antibody titres
Period | Patient-weeks (n) | Attacks (n) | Attack rate/y |
---|---|---|---|
All symptomatic URTI:1-150 | |||
At risk | 430 | 27 | 3.3 |
Not at risk | 2086 | 65 | 1.6 |
Serologically proved viral infection:1-160 | |||
At risk | 64 | 7 | 5.7 |
Not at risk | 1552 | 50 | 1.7 |