United States
In the United States routine influenza vaccination is recommended for all persons aged six months and over. It takes up to two weeks after vaccination for sufficient antibodies to develop in the body. The CDC recommends vaccination before the end of October, although it considers getting a vaccine in December or even later to be still beneficial.According to the CDC, the live attenuated virus (LAIV4) (which comes in the form of the nasal spray in the US) should be avoided by some groups.Within its blanket recommendation for general vaccination in the United States, the CDC, which began recommending the influenza vaccine to health care workers in 1981, emphasizes to clinicians the special urgency of vaccination for members of certain vulnerable groups, and their caregivers:

Vaccination is especially important for people at higher risk of serious influenza complications or people who live with or care for people at higher risk for serious complications. In 2009, a new high-dose formulation of the standard influenza vaccine was approved. The Fluzone High Dose is specifically for people 65 and older; the difference is that it has four times the antigen dose of the standard Fluzone.The US government requires hospitals to report worker vaccination rates. Some US states and hundreds of US hospitals require health care workers to either get vaccinations or wear masks during flu season.
For some patients with intense affliction, there often can be unremitting nausea, causing vomiting. The pain can also bring on hyperventilation. Blood pressure can rise due to the pain. Cause
Damage to the CNS can be caused by car accidents, limb amputations, trauma, spinal cord injury, tumors, stroke,  immune system disorders or diseases, such as multiple sclerosis, Parkinsons, Graves or Addisons disease, rheumatoid arthritis, and epilepsy. It may develop months or years after injury or damage to the CNS. Diagnosis
A diagnosis of central pain syndrome is based upon identification of characteristic symptoms, a detailed patient history, a thorough clinical evaluation and a variety of specialized tests. Central pain syndrome is suspected in individuals who complain of pain or other abnormal sensations following injury to the central nervous system. Other conditions that cause pain may need to be excluded before a diagnosis of central pain syndrome is made. Treatment
Pain medications often provide some reduction of pain, but not complete relief of pain, for those affected by central pain syndrome. Tricyclic antidepressants such as nortriptyline or anticonvulsants such as neurontin (gabapentin) can be useful, but also provide incomplete relief. Lowering stress levels appears to reduce pain. For regular treatment some people prefer body length heating pads while others rely on warm baths. Prognosis
Central pain syndrome is not a fatal disorder, but the syndrome causes disabling chronic pain and suffering among the majority of individuals who have it. See also
Thalamic syndrome

References
Further reading
Canavero S, & Bonicalzi V (2007) Central pain syndrome.