Ref Number = PITIKA-ASPR0191
Herka Pratam Putra, Edy Novery, R.A Myrna Alia, Yusmala Helmy
Background: Henoch-Schonlein purpura (HSP) is a disease involving inflammation of small blood vessels. It most commonly occurs in children.The main symptomps are rashes with numerous small bruises, which have a raised appearance over the legs or buttocks.The exact cause of HSP is not known. The body immune system is believed to play a role in targeting the blood vessels involved. Approximately two-thirds of the case of HSP occurs days after symptomps of an acute respiratory tract infection (ARI) develop. Colder weather of fall and winter may also be associated with HSP. 
Methods: We retrospectively reviewed medical records of patients diagnosed with HSP between January 2016 and December 2018. Rainfall intensity during that period was obtained from Badan Meteorologi, Klimatologi dan Geofisika of South Sumatera. Prevalence of ARI in Palembang was obtained Health Department of South Sumatera Province. Correlations between number of HSP cases with rainfall intensity and with prevalence of ARI were calculated. 
Results : There were 60 cases of HSP during the study period, with median monthly number of cases 2 (0 – 5). Rainfall intensity ranged between 43.3 and 452.4 mm3. Average monthly prevalence of ARI was 17,489 (SD 2047) cases. There were no correlation between number of HSP cases with rainfall intensity (p = 0.945 , r = -0.012) or with the prevalence of ARI (p = 0.097, r = 0.281). 
Conclusion: There werere no correlation between number of HSP cases with rainfall intensity or prevalence of ARI. Further study is needed to identify the effects of these factors in relation to other factors that may be associated with HSP.
Keywords: Henoch-Schonlein purpura (HSP), acute respiratory tract infection (ARI), rainfall intensity
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