fever in kids

You shouldn't use the oral or rectal routes to measure the temperature of children aged 0-5 years
In children aged 4 weeks to 5 years, you should measure body temperature by one of the following methods:

Electronic thermometer in the axilla
Chemical dot thermometer in the axilla
Infrared tympanic thermometer.
Children in the following categories are in a high risk group for serious illness:

Children younger than 3 months of age with a temperature of 38ºC or higher
Children aged 3-6 months with a temperature of 39ºC or higher
Antipyretic agents do not prevent febrile convulsions and should not be used specifically for this purpose

2: Summary table for symptoms and signs suggestive of specific diseases
Diagnosis to be considered Symptoms and signs in conjunction with fever
Meningococcal disease Non-blanching rash, particularly with one or more of the following:

An ill looking child
Lesions larger than 2 mm in diameter (purpura)
A capillary refill time of ≥3 seconds
Neck stiffness.

Meningitis One or more of the following:

Neck stiffness
Bulging fontanelle
Decreased level of consciousness
Convulsive status epilepticus.

Herpes simplex encephalitis Herpes simplex encephalitis should be considered in children with fever and any of the following features:

Focal neurological signs
Focal seizures
Decreased level of consciousness

Pneumonia You should consider pneumonia in children with fever and any of the following signs:

Tachypnoea
(RR > 60 breaths per minute Age 0-5 months,
RR > 50 breaths per minute Age 6-12 months;
RR > 40 breaths per minute Age >12 months)
Crackles
Nasal flaring
Chest indrawing
Cyanosis
Oxygen saturation ≤95% on air.

Urinary tract infection You should think of a urinary tract infection in a child aged 3 months and older with fever and one or more of the following:

Vomiting
Poor feeding
Lethargy
Irritability
Abdominal pain or tenderness
Urinary frequency or dysuria
Offensive urine or haematuria.

Septic arthritis Septic arthritis/osteomyelitis should be considered in children with fever and any of the following signs:

Swelling of a limb or joint
Not using an extremity
Non-weight bearing.

Kawasaki disease Fever for more than five days and at least four of the following:

Bilateral conjunctival injection
Change in mucous membranes (for example, injected pharynx, dry cracked lips, or strawberry tongue)
Change in the extremities (for example, oedema, erythema, or desquamation)
Polymorphous rash
Cervical lymphadenopathy.
Healthcare professionals should be aware that, in rare cases, incomplete/atypical Kawasaki disease may be diagnosed with fewer features