Infectious meningitis may be bacterial, viral, fungal and parasitic origin. All of these have meningitis, both general combining their symptoms, and the symptoms unique to any particular type of meningitis. Sometimes to distinguish one type of meningitis from another only after laboratory testing of cerebrospinal fluid.
How is infectious meningitis
Infectious meningitis may be caused by very different infections: bacterial, viral, fungal, protozoan, various parasites. However, they are divided into two large groups of serous (aseptic predominantly viral) and purulent (mostly bacterial).
Pathogens that cause infectious meningitis can be transmitted in different ways. For example, bacterial meningitis infections, and meningitis caused by enterovirus infection is transmitted mainly by airborne droplets and through the hands and objects contaminated with saliva (bacterial) or faeces (enteroviruses).
Very often, bacterial meningitis are secondary, that is, the infection enters the cranial cavity through the bloodstream from the main focus of inflammation. Tuberculous meningitis is almost always secondary.
Some types of meningitis can be infected by inhaling dust from contaminated feces of animals, such as house mice (acute lymphocytic choriomeningitis benign) or birds (fungal cryptococcal meningitis).
The incubation period of an infectious meningitis
Incubation (the time from ingestion of infection to onset of symptoms) during infectious meningitis also can be different. For example, in the most common form of bacterial meningitis
Bacterial meningitis - the reasons for the spread of infection
- Meningococcal he is an average of 6-7 days, but can be set to 12 hours and three weeks.
The incubation period is also common enteroviral meningitis
Enterovirus meningitis - the most common type
is 2-12 days. The incubation period for mumps meningitis ranges from 11 to 23 days (average 18-20 days), but sometimes it can take up to 35 days.
Symptoms
Symptoms of infectious meningitis can be different depending on the type of pathogen infection. However, virtually all types of meningitis in varying degrees of severity present symptoms such as headache, nausea, vomiting, and a general increase in sensitivity to touch, light and sound typical meningeal posture, meningeal symptoms.
Headache is often diffuse nature of the (whole head hurts), but sometimes it can be located in the frontal and occipital areas. Headache occurs due to irritation of sensitive nerve endings in the brain membranes.
Along with the headache appears vomiting caused by irritation of the vagus nerve receptors. Most nausea before vomiting, but it may not be. A feature of vomiting with meningitis is that it does not bring relief, and is not connected with food intake. Vomiting can be both single and repeated during the day.
Increased sensitivity of meningitis may be the skin (associated with touch), visual and auditory.
For the patient with meningitis is characterized by a special position: the head thrown back, arms bent and pressed against his chest, legs bent, knees to the stomach are given. Meningeal pose and all other meningeal symptoms develop because of the tonic contraction of muscle.
Infectious meningitis
Meningitis - an inflammation of the meninges
occurs in children with the same symptoms, but can have a meningeal symptoms in children (especially in young) erased unspoken character. Very often they prevail cerebral symptoms of disorders of consciousness and seizures. In infants, signs of meningitis
Symptoms of meningitis - cerebral symptoms
may be bulging and pulsing of a large fontanelle.
Diagnosis and treatment
In the diagnosis of infectious meningitis is of particular importance the study of cerebrospinal fluid (CSF), taken by a puncture of the spinal cord. The CSF in purulent meningitis infection is detected neutrophilic pleocytosis, while serous - lymphocytic pleocytosis. Pleocytosis - is to increase the content of cells in the cerebrospinal fluid. Normally this rate should not exceed 5 cells in 1 mm, meningitis when he reaches several hundreds or even thousands of cells, mainly white blood cells. Thus in purulent meningitis predominant one type of leukocytes (neutrophils), and at the other nonsuppurative (lymphocytes).
The blood of a patient with meningitis can detect signs of inflammation - a lot of white blood cells (leukocytosis) and accelerated ESR
Treatment of any type of meningitis is carried out only in a hospital. First aid seriously ill with meningitis, accompanied by high intracranial pressure, is also a lumbar puncture - removal of a small amount of liquor brings them relief.
Galina Romanenko