communicable disease

• a pathogen is micro organisms that cause disease in a host
• pathogens can be bacterial, viral, fungi and protists
• measles are spread by cough or sneeze droplets
• measles symptoms include fever, runny nose, red eyes, dry hacking cough, rash all over the body
• measles prevention includes vaccination, hand washing, covering mouth when coughing/sneezing, avoiding contact with infected people
• hiv is spread by sexual contact and exchange of bodily fluids
• hiv symptoms include flu like illness, swollen lymph nodes, fatigue, weight loss, skin rashes, night sweats, diarrhea
• hiv prevention includes condoms, abstinence, monogamy, clean needle programs, avoidance of high risk behaviors
• if hiv is not treated then it can lead to aids
• tmv is spread by contact between leaves
• tmv affecs potato, tomato, tobacco, and many other plants
• tmv changes leaf colour to a yellow and white mosiac pattern
• tmv reduces photosynthesis as no green pigment in chlorophyll
• reduce tmv spread by destroying affected plants
• rose black spot is fungal
• measles , hiv, tmv are viral diseases
• rose black spot cause black and purple spots casuing leaves to turn yellow
• yellow leaves mean no photosynthesis as no green pigment in chlorophyll
• rose black spot is spread by wind and water
• treat rose black spot by stripping infected leaves then destroying them
• bacterial diseases are salmonella and gonorrhoea
• salmonella is spread by bacteria in food in unhygenic conditions
• gonorrhoea symptoms include pain when urinating and discharge from vagina or penis
• symptoms of salmonella include diarrhoea, fever and stomach cramps
• gonorrhoea can be treated with antibiotics
• in uk, poultry is vaccinated against salmonella
• protist disease is malaria
• mosquitos are the vector that transmit malaria to humans
• malaria causes high temperature, headache, muscle pain and fatigue
• malaria is prevented using mosquito nets