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.
Once one of your plants is infected by a fungus, it is important that you protect your other plants from the fungal infection. Plant diseases that are caused by fungi reduce the crops, create markings, affect the flowers and fruits, finally causing death of the plant.Majority of the plant diseases, about 8,000, are caused by fungi. Let's have a look at the major ones below.Along with fungi, even bacteria and viruses affect plants. At the same time, some plant diseases are caused by adverse environmental and climatic conditions.There are some plants that have a natural resistance to certain diseases, especially if these diseases and the plants have evolved together.t affects the growth and strength of the plant. Damping Off-This is a disease that infects the seedling of the plant, caused by different fungi -- Pythium and Phytophthora being some of them. It infects the seed and decays it, thus affecting the growth and vigor of the whole plant.