The language and the terminology seems inconclusive.The high blood is no term. probably the question means to refer to high blood count.The blood cantains various elements like RBC
,platelets whose count may be high. All the three elements are known to increase in different disease.one of the subcomponents of WBC rises in viral infections called lymphocytes.
Such reactions are called as leukemoid reactions. For further analyses exact meaning of what you are asking is required.