The ornamental design for a sterilecover, as shown and described.
FIG. 1 is a top perspective view of a sterile cover, showing our new design;
FIG. 2 is a bottom perspective view of FIG. 1;
FIG. 3 is a front elevational view of FIG. 1;
FIG. 4 is a back elevational view of FIG. 1;
FIG. 5 is a left elevational view of FIG. 1;
FIG. 6 is a right elevational view of FIG. 1;
FIG. 7 is a top plan view of FIG. 1; and,
FIG. 8 is a bottom plan view of FIG. 1.
The dashed lines immediately adjacent to the shaded areas in the figures represent the boundaries of the sterile cover. The dashed lines in the figures illustrate the portions of the sterile cover that form no part of the claimed design. None of the broken lines form any part of the claimed design.