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2. Haematology.
2. Haematology.
−
3. Analysis of faeces; use of an '''Elisa''' to detect the virus antigen or detecting the virus DNA, using a '''PCR''' (Polymerase chain reaction.)
+
3. Analysis of faeces; use of an '''ELISA''' to detect the virus antigen or detecting the virus DNA, using a '''PCR''' (Polymerase chain reaction.)
4. Evidence of exposure to virus - detect antibody to virus within the blood.
4. Evidence of exposure to virus - detect antibody to virus within the blood.