Usepackage cancel in the preamble gives you four different modes of striking through. Cancelto value expression draws a diagonal arrow through the expressionpointing to the value (math-mode only) you can get cancel at ctan. In this case the center of the circumscribed circle has to be calculated before using through. I just used the straightedge and compass construction to calculate the center and then drew circle. as for the substantive issue you raise, its true the transmission of hiv by genital fluids most probably occurs through virus-infected cells since they can be present in larger numbers than free virus in the body fluids (jay levy, pathogenesis of human immunodeficiency virus infection, microbiological reviews, march 1993 an exhaustive treatment of the subject). After making a path this way, there are two parameters that can be changed, scale and the rounded corner s width. To both scale the image and keep it smooth, it turns out neccesary to change both the scaling factor and the corner width. in the words of the cdc latex condoms provide an essentially impermeable barrier to particles the size of hiv. watch me push a quarter through a sheet of latex with no visible hole! The latex is self healing and will close the hole once the item is pushed through! Great magic trick you can do. Other tests have shown that under normal conditions, hiv does not pass through a latex condom that is not torn or broken. This is not because of surface tension or hydrogen bonding in water, it is because electron microscopy has shown that the pores or holes mentioned in the argument are not there not there to begin with. One type of vinyl and seven types of latex gloves without visual defects were tested with respect to their barrier function against high concentrations of three viruses of varying size herpes simplex virus type 1 (hsv-1, 180 nm), human immunodeficiency virus type 1 (hiv-1, 100 nm), and echovirus type 9 (echo 9, 25.).