Evaluation of first aids: B lo o d v e n o m l e ve ls (m e d ia n, n g / m l) <6h 6 - 12h >12h-24h >24h Time since accident (hours) Interference of the first aids on the results of CRT tested on fluid samples from bitten s ite: The rate of positive or negative result CRT were not different among f irst aid patients or non-first aid patients, in term of squeezing or sucking of blood from bitten site, incision, constricted band, bitten site sterlization, washing, local application or ingestion of traditional medicine.