âif you have HIV and one or more of these OIs, you will be diagnosed with AIDS, no matter what your CD4 count happens to be: 1  of bronchi, trachea, esophagus, or lungs. , 2  chronic intestinal (greater than 1 month's duration). 3  disease (particularly CMV retinitis). , 4  HIV-related.
Organisms that cause infectious disease include fungi, oomycetes, bacteria, viruses, viroids, virus-like organisms, phytoplasmas, protozoa, nematodes and parasitic plants.Not included are ectoparasites like insects, mites, vertebrate, or other pests that affect plant health by consumption of plant tissues.rganisms that cause infectious disease include fungi, oomycetes, bacteria, viruses, viroids, virus-like organisms, phytoplasmas, protozoa, nematodes and parasitic plants.
What causes plant disease? Most people would answer this question by saying that plant pathogens, such as fungi or bacteria, cause plant disease. But this is only part of the answer. Plant pathologists talk about a combination of three crucial factors that must be present to have plant disease.or example, to have Septoria leaf spot on tomato plants, we need a tomato plant that is able to get this disease. Secondly, a pathogen must be present--some organism that causes disease, such as the Septoria fungus that attacks tomato leaves.