Importance and Value of Trees. Since the beginning, trees have furnished us with two of lifeâs essentials, food and oxygen. As we evolved, they provided additional necessities such as shelter, medicine, and tools. Today, their value continues to increase and more benefits of trees are being discovered as their role expands to satisfy the needs created by our modern lifestyles.
However, the most serious is called psittacosis. With this disease, an agent called Chlamydia psittaci causes it, and the disease is also called ornithosis. Birds can be asymptomatic carriers, and may only fall ill when upset, as stress is a major component in all avian diseases.
Credit: AP Photo/Petar Petrov. Catch scratch disease A bacterial infection, cat scratch disease - a.k.a. cat scratch fever - can spread to humans via the bite or scratch of an infected feline. Most people with CSD develop a mild infection, though some get swollen lymph nodes, fever, and fatigue. The illness can be particularly severe for people with reduced immunity.