How to italicize part (one or two words) of an axis title

Question

Is there any way to change the style of part of an axis title while keep the rest part unchanged? In my case, How could I italicize
\"bacteria X\" in the y-axis title? T

Answer 1

You could make an expression like this:

my_y_title <- expression(paste("No. of ", italic("bacteria X"), " isolates with corresponding types"))
.... + labs(y=my_y_title)