(Redirected from Opportunistic infections) An opportunistic infection is an infection caused by pathogens (bacteria, viruses, fungi, or protozoa) that take advantage of an opportunity not normally available, such as a host with a weakened immune system, an altered microbiota (such as a disrupted gut flora), or breached integumentary barriers.
If someone is described as being 'rough around the edges' it means they are generally good but have a few faults on the outside. Rough around the edges has many meanings: Worn out; Not polished or refined; Not great but not bad either; ans Unkempt.
The surface roughness is evaluated by the height, Rt and mean roughness index Ra of the micro-irregularities. Surface roughness number Represents the average departure of the surface from perfection over a prescribed sampling length, (usually selected as 0.8 mm) Surface roughness number (Ra) is expressed in microns.he surface roughness is evaluated by the height, Rt and mean roughness index Ra of the micro-irregularities. Surface roughness number Represents the average departure of the surface from perfection over a prescribed sampling length, (usually selected as 0.8 mm) Surface roughness number (Ra) is expressed in microns.