virus tal ħosba razza enders  edmonston ≥ 3 00 log10 ccid50 * virus tal gattone razza jeryl lynntm (livell b) ≥ 4 30 log10 ccid50 * virus tar rubella wistar ra 27/ 3 ≥ 3 00 log10 ccid50 * virus tal ġidri r riħ razza oka/ merck ≥ 3 99 log10 pfu **