Diseases & National Health Programme
True about Polio? (DNB June 09)
|A||All the affected patients are usually symptomatic|
|B||Muscular exercise in paralytic polio|
|C||Spastic type of paralysis occurs|
|D||PPI under 3 years|
(Ref: Park 22nd edition; Pg: 184)
a. Inapparent or subclinical polio →
b. Occurs in 95% Q of polio virus infection
c. Abortive or minor or self limiting illness →
d. Occurs in 4-8% of polio virus infection
e. Occurs due to viremia
f. Clinical diagnosis not possible requires virus isolation or rising ab titre.
g. Non-paralytic polio →
a. Occurs in 1% of polio virus infection
b. Lasts for 2-10 days, recovery is rapid.
c. Synonymous with aseptic meningitis.
h. Paralytic polio →
i. Occurs in less than 1% of polio Q virus infection
ii. Virus invades CNS.
iii. Predominant sign is asymmetrical flaccid paralysis
iv. ‘Tripod sign’ may be present.
· A rough estimate of all clinical cases of polio could be made by, multiplying the prevalence rate of residual paralysis due to polio by 1.33.
· No. of clinical cases = 1.33 x prev of residual paralysis
· The total prevalence of residual paralysis due to poliomyelitis could be estimated by multiplying the prevalence of lameness due to polio by 1.25 and reported as cases per 1000 usually in children older than 5 years.
Prev. of RP = 1.25 x lameness prevelance
No. of clinical cases = lameness prevalence x 1.7 = 1.7 x lameness prevalence