Answer:
Because there will be no trace of any infection before 7 days because eukaryotic parasites start spreadinv in 7 days and lasts till one month.
Step-by-step explanation:
Eukaryotic parasites needed to be reported after 7 days because they start spreadinv in 7 days after exposure and last till one months. Before 7 days there won't be any trace of eukaryotic parasites because they will not have start spreading by then because eukaryotic parasites grow slowly that prokaryotic parasites so there will be slower disease progression.
Most damage caused by eukaryotic parasites is due to their growth inside host cell and eukaryotic infections are difficult to treat because their physiology is similar to that of man.
Eukaryotic parasites are parasites that live inside their host causing damage and having nucleus and membrane bound organelles.