Complete the following paragrath
(plasma, antigenic, bacterial or viral or antigenic, antigen , animal or human, antigen, bacteria or virus, antibodies, blood)Serums contain (i) ............. substance of a particular (ii) ............. and they are used as preventive measure against (iii) ............. invasions. To prepare serum, a small quantity of bacterial (iv) ............. is injected into a healthy (v) ............. . The animal body produces (vi) ............. to neutralise the effect of toxin. This process is repeated for several rounds and (vii) ............. of such animal is taken out and on chilling, it clears as straw colour liquid (viii) ............. . Snake bites are treated by producing anti-venom from the blood of (ix) ............. .
