Dear Uriel, these calculations can be done with basic R language (or basic Excel functions), you don't need a specific package for this.

For example, put your results in a data frame (I call it xdata below), with different columns for the different parasites and rows for the samples/hosts. Indicate infection by 1, absence of infection by 0. You will get the prevalence in % for "parasiteX" by the following code:

length(which(xdata$parasiteX==1))/nrow(xdata)*100

Similary, you can use mean(xdata$parasite_abundance_X) to get the mean of a column, sd() to get the standard deviation...

Uriel Arnaldo Torres Zevallos Try this online software this may be helpful for some of calculations. http://www.winepi.net/

thank you very much for your reply!