Haemophilus Influenzae Type B Hib

Overview

Hib is a type of bacteria (a germ) called Haemophilus influenzae type b. Despite the name, it has nothing to do with the flu — the 'influenzae' part is just a historical label. Hib usually lives harmlessly in the nose and throat, and many people carry it without ever feeling ill. But sometimes it gets into the blood or other parts of the body and causes serious infections, especially in young children. This is why babies are routinely vaccinated against Hib.

Serious Hib disease is now uncommon in countries with routine childhood vaccination. In the UK, cases dropped by more than 90% after the vaccine was introduced in 1992. It is still more common in parts of the world where vaccination coverage is lower.

Hib mainly affects children under 5 years old, and babies under 2 are most at risk because their immune systems are still developing. It can also affect adults with weakened immune systems, people without a spleen, and those receiving certain cancer treatments. Healthy older children and adults are rarely affected.

Symptoms

Common symptoms

• Symptoms depend on which part of the body the bacteria affect, so they vary a lot from person to person.
• High fever and generally feeling very unwell.
• Irritability, sleepiness, or being hard to wake.
• Refusing to feed or eat, and vomiting.
• Stiff neck, headache, or sensitivity to light (suggesting meningitis).
• Difficulty breathing, noisy breathing, or a barking cough (suggesting epiglottitis or pneumonia).
• Swelling, redness, or pain in a joint or area of skin.

Symptoms in children

• In babies, a bulging or tense soft spot on the top of the head (the fontanelle).
• A high-pitched cry or moaning, and being floppy or unusually stiff.
• Not waking for feeds, or feeding much less than usual.
• Fast breathing, grunting, or lips looking blue or grey.
• A rash that does not fade when you press a glass against it — this needs emergency help.
• Seizures (fits) or jerky movements.

Symptoms in older adults

• Fever with confusion or new drowsiness.
• Severe sore throat with difficulty swallowing or drooling.
• Chest infection symptoms such as cough, breathlessness and chest pain.
• Symptoms can be less obvious in older adults, so a general decline or confusion matters.

Causes

Main causes

• Infection with the bacterium Haemophilus influenzae type b.
• The bacteria spread from person to person in tiny droplets released by coughing or sneezing, or through close contact such as kissing.
• Many people carry Hib in their nose and throat without any symptoms and can pass it on without knowing.
• The bacteria sometimes move from the throat into the blood, then to the brain lining, lungs, throat, joints or skin, where they cause illness.

Risk factors

• Not being vaccinated, or not having completed the full course of Hib vaccines.
• Being a baby or young child under 5, especially under 2.
• A weakened immune system, for example from chemotherapy, HIV, or immune-suppressing medicines.
• Having no spleen or a spleen that does not work properly.
• Living in crowded conditions or attending a setting with many young children where vaccination rates are low.
• Being an adult at higher risk — some adults with certain health conditions may be offered Hib vaccination.

When to see a doctor

See a doctor urgently if:

• Any baby under 3 months with a fever.
• A child or adult who is breathing fast, seems very unwell, or is getting worse quickly.
• Fever with a stiff neck, severe headache, or a rash that does not fade under pressure.
• Difficulty swallowing, drooling, or a change in voice with a high fever.
• Swelling, redness or pain in a joint or on the skin, especially with fever.

Book a routine appointment if:

• You are unsure whether your child's vaccinations are up to date.
• Your child has a fever that has lasted several days.
• You have a health condition that affects your immune system and want to check whether you need any extra vaccinations.
• You are planning travel to an area with lower vaccination rates and want advice.
• You have questions about Hib or the vaccine and would like to talk them through.

Diagnosis

A doctor will start by asking about symptoms and examining the person, especially their breathing, neck, skin and level of alertness. Hib is confirmed by finding the bacteria in samples taken from the body — most often blood, or the fluid that surrounds the brain and spinal cord. Because Hib can become serious quickly, treatment is usually started straight away while test results are pending.

Tests that may be done

• Blood tests, including a blood culture that looks for bacteria in the blood.
• A lumbar puncture (spinal tap) if meningitis is suspected — a small sample of the fluid around the spinal cord is tested.
• A throat swab or sample of fluid from the airway.
• Chest X-ray if pneumonia is suspected.
• Scans such as a CT or MRI of the head in some cases.
• Testing of any fluid from a swollen joint or an infected area of skin.

What to expect at your appointment

If Hib is suspected, the person will usually be assessed in hospital. Some tests, like a blood test, are quick. A lumbar puncture may sound daunting, but it is done carefully, often with pain relief or light sedation for children, and it gives important answers. Results for some tests take a day or two, so treatment often begins before results come back.

Treatment

Hib infections are serious and need hospital treatment. The main treatment is antibiotic medicine given directly into a vein, alongside support such as fluids, oxygen and close monitoring. Most people recover well with prompt treatment.

Self-care at home

• Hib itself cannot be treated at home — it needs medical care. Self-care is about supporting recovery afterwards.
• Make sure the person rests and drinks plenty of fluids once they are recovering.
• Give over-the-counter pain or fever relief only as advised by a pharmacist or doctor, and follow the label — never give aspirin to children under 16.
• Keep up with any follow-up appointments, including hearing checks after meningitis.
• Wash hands often and cover coughs and sneezes to help protect others while someone is unwell.

Medical treatments

Treatment usually happens in hospital. Doctors give antibiotic medicine through a drip (a thin tube into a vein) for a number of days. In addition, the care team supports breathing with oxygen or extra help if needed, gives fluids, and monitors closely for complications. If someone has been in close contact with a person who has Hib disease, a doctor may offer them protective antibiotic medicine or vaccination to stop it spreading — this is decided case by case by public health teams.

When is surgery considered?

Surgery is rarely needed for Hib. Occasionally a doctor may need to drain a build-up of pus, such as from an infected joint or a collection in the chest, if medicines alone are not enough. This is decided individually by the medical team.

Living with this condition

Most children and adults make a full recovery after Hib treatment, though some need a period of rest and follow-up appointments. If the illness affected the brain or hearing, regular check-ups may be arranged. Day to day, the focus is on gentle recovery, good sleep, and returning to normal routines when the person feels ready.

Lifestyle tips

• Keep vaccinations up to date for everyone in the household — this is the single best protection.
• Encourage handwashing and covering coughs and sneezes.
• Make sure anyone with a weakened immune system gets personalised vaccination advice.
• Allow plenty of rest during recovery and build activity back up gradually.
• Keep a note of follow-up appointments and any hearing or development checks.

Diet and exercise

During recovery, offer small, frequent meals and plenty of fluids, especially if appetite is low. Once the person feels better, normal healthy eating and gentle activity are fine, building back up over days to weeks. There is no special diet that treats or prevents Hib.

Mental health and emotional wellbeing

A serious infection in a child is frightening for parents and carers, and it is completely normal to feel anxious afterwards. Some children have upsetting memories of hospital. Talking about what happened, asking questions at follow-up appointments, and leaning on family and friends all help. If worry or low mood is lasting or getting in the way of daily life, speak to a doctor — support is available.

Prevention

Yes. Hib is largely preventable through vaccination, which is why serious cases are now rare in the UK and many other countries. Good hygiene, such as handwashing and covering coughs and sneezes, also helps reduce the spread of the bacteria.

Vaccines

The Hib vaccine is given to babies as part of routine childhood immunisation. In the UK it is included in the baby combination vaccines at around 8, 12 and 16 weeks, with a booster at around 1 year old. It is also offered to some older children and adults with certain health conditions, such as those without a working spleen or with weakened immune systems. Ask your doctor, nurse or health visitor if you are unsure whether you or your child are up to date — the vaccine is safe and very effective.

Screening programmes

There is no routine screening test for Hib. If someone has been in close contact with a confirmed case, public health teams may advise a protective course of antibiotics or vaccination. This is arranged for you; you do not need to request a test.

Complications

If left untreated

• Meningitis (infection of the lining around the brain and spinal cord), which can be life-threatening.
• Epiglottitis — swelling of the flap at the top of the windpipe that can block the airway.
• Pneumonia (infection of the lungs).
• Infection of the blood (sepsis).
• Infection of joints (septic arthritis) or of the skin and tissue (cellulitis).
• Long-term effects after meningitis, such as hearing loss, learning difficulties, or seizures, in a minority of people.

Long-term outlook

The outlook for Hib today is good. Because of vaccination, serious cases are rare, and when they do happen, prompt antibiotic treatment means most people recover fully. Some people need follow-up checks after meningitis, such as hearing tests. The most important step you can take is to keep vaccinations up to date — that protects your child and the wider community.

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