Mainland rhinovirus is active, and more Hongkongers are travelling north. How can you spot it, prevent it, and know when to see a doctor?

Winter has always been a season when respiratory viruses “stack up”. Recent sentinel surveillance by the Chinese Center for Disease Control and Prevention has noted that influenza remains the main pathogen, but rhinovirus is also maintaining a certain level of activity, and the detection rate of rhinovirus among “influenza-like cases” is showing signs of increase (in some southern provinces, it has even risen to second place, just behind influenza).

At the same time, Hong Kong people are travelling north more frequently for shopping, visiting relatives, and short trips — when crowds are denser and there are more transport and indoor settings, it becomes even easier to end up “only starting to have a runny nose and sore throat after returning to Hong Kong”.

This article aims to explain, from the most practical perspective, what rhinovirus is, its typical symptoms, how to distinguish it from influenza/RSV/COVID-19, how to protect yourself before, during and after travelling north, and when to see a doctor.

Human rhinovirus (HRV) is one of the most common viruses that causes the common cold. You may think it is “just a cold”, but because it spreads easily, has many types, and often circulates alongside other respiratory viruses, many people catch it every winter.
There are several features of rhinovirus that can make it feel difficult to guard against:

• Short incubation period: from infection to the onset of symptoms, it is usually around 12 hours to 3 days (though this can vary from person to person).
• The illness is usually not long, but it can be quite unpleasant: most people have symptoms for less than 7 days, but it may last up to 2 weeks. 
• Symptoms are similar to those of other viruses: based on whether you currently have a blocked nose or a fever, it is actually very difficult to accurately tell which virus is responsible.

Monitoring by the China CDC shows that, in recent times, in addition to influenza viruses, rhinovirus has also been one of the common pathogens causing respiratory symptoms, and it noted that rhinovirus detection rates have fluctuated and remained active at a certain level.

For people in Hong Kong, the reason going north is particularly likely to lead to infection is usually not that “one particular place is especially dangerous”, but rather because you may be exposed to multiple high-risk situations at the same time:

• Border checkpoints / high-speed rail / MTR: crowded, close contact, and contact with public facilities (handrails, gates, seats, luggage racks)
• Shopping malls / restaurants: enclosed spaces, ventilation may not be good, and hand contact with ordering machines / door handles / lifts
• Family and children scenarios: after children touch toys and then touch their eyes, mouth or nose, a transmission chain can easily be established

In addition, as the incubation period can last several days, you may see a common timeline:
No symptoms on the day of going north → runny nose / sore throat starts 1–3 days after returning to Hong Kong (which happens to match the typical incubation period range).

3.1 Common Symptoms of Rhinovirus/Common Cold

The most typical symptoms of rhinovirus are those of the “upper respiratory tract”, such as:

• Runny nose / blocked nose
• Sneezing
• Sore throat / itchy throat
• Cough (sometimes only appears later)
• Headache, mild muscle aches, low fever or no fever

3.2 How to Tell it Apart from Flu (Only in terms of “tendencies”, not “certainty”)

• Flu: sudden high fever, widespread body aches, extreme fatigue, feeling too weak to move are more common
• Common cold / rhinovirus: runny or blocked nose, itchy or sore throat are more common, and fever may not be obvious

However, please note: symptoms alone may not always allow you to tell them apart, especially during seasons when multiple viruses are circulating at the same time. If you need to know exactly what it is, the quickest way is still to have a test / be assessed by a doctor.

3.3 RSV / COVID-19: Who Should Take Extra Care?

Rhinovirus is usually mild, but if the following groups are infected, symptoms may be more severe, or complications / airway issues may be more likely to occur:

• Young children (especially under 5 years old)
• Older adults
• People with chronic conditions such as asthma, chronic lung disease, or cardiovascular disease
• People with weakened immunity

(The next section will explain clearly “when to see a doctor”.)

Rhinovirus is mainly spread through droplets/close contact, as well as “touching a contaminated surface → then touching the eyes, mouth or nose”. In cross-border travel or commuting situations, what is most likely to catch you out is often “that one careless moment”:

Escalator handrail → then picking up chips to eat
Ordering kiosk → then rubbing your eyes
Tube handrail → then touching the inside of your mask and your nose

So the prevention strategy does not need to be complicated. The key is to “reduce inhalation and reduce virus transfer by hand”:

In crowded, enclosed places: wearing a mask can reduce the risk of inhaling droplets (especially if someone around you is coughing)
Before eating / after touching public facilities: use alcohol hand sanitiser or wash your hands
Before washing your hands: avoid touching your face as far as possible (eyes, nose, mouth)

5.1 Most cases: symptom relief + rest

• The US CDC states that when symptoms occur, they usually last less than 7 days, but may continue for up to 2 weeks.
• As there is no specific treatment or vaccine for rhinovirus, management is generally centred on rest, staying hydrated, and relieving symptoms. 

5.2 Signs that you should seek medical advice (do not try to push through if any of these occur)
(The following is general health information, not personal medical advice; if the situation is urgent, seek immediate help)

• Difficulty breathing/shortness of breath, wheezing, chest pain
• High fever that persists or recurs over several days
• Young children: low energy, refusing food or drinks, reduced urine output (risk of dehydration)
• Older adults/people with chronic conditions/immunocompromised individuals: symptoms worsening rapidly

6.1 Before travelling north (1 day before to the day of departure)

• If you are travelling with children/elderly family members: bring masks, alcohol hand sanitiser and tissues
• If your itinerary is tightly packed: allow time for rest (fatigue can make you more likely to feel very unwell after catching something)
• If you already have clear symptoms (persistent coughing, fever): try to avoid going if possible (and reduce the risk of spreading it to family members travelling with you)

6.2 During the trip north (transport + shopping malls + restaurants)

• In crowded, enclosed spaces: wear a mask (especially if someone near you is coughing)
• Sanitise your hands before meals; try to avoid touching public surfaces and then touching your mouth straight away
• For family outings: have children wipe their hands after playing with shared toys

6.3 After returning to Hong Kong (first 1–5 days)

• Watch for signs such as “blocked nose, runny nose and sore throat” (consistent with the usual incubation period). 
• If you have elderly family members or a newborn at home: try to avoid close contact and sharing tableware to reduce household transmission
• If you need to go to work or school: if you develop a cough, pay extra attention to wearing a mask and washing your hands regularly

Most rhinovirus infections are mild, but in the “real world”, the main concern is often not the runny nose itself, but:

• Symptoms dragging on, requiring repeated doctor visits
• The need for rapid tests/PCR to distinguish influenza, COVID-19, etc. (especially where there are high-risk people at home)
• In a small number of cases, severe airway symptoms, bronchitis/pneumonia, etc., which may require hospital observation (more common in high-risk groups)

If you would like to first understand the general insurance design of Hong Kong Voluntary Health Insurance Scheme (VHIS) for hospitalisation, surgery, tests, etc., you can use this page for a basic comparison first:
Voluntary Health Insurance Scheme comparison

Q1: Is rhinovirus the same as influenza?
No. Rhinovirus usually causes the common cold; influenza is caused by a different virus. The symptoms can be similar, but influenza more commonly causes a high fever and body aches. Accurate differentiation usually relies on a doctor’s assessment and testing.
Q2: Can rhinovirus be serious?
It is mostly a mild illness and improves within a few days to one or two weeks. However, infants and young children, older people, and those with asthma/chronic illnesses or weakened immunity should pay closer attention to signs of worsening.
Q3: Why do symptoms only appear after returning from the Mainland?
Because there is an incubation period between infection and the onset of symptoms. It commonly ranges from around 12 hours to 3 days, though it may be longer in some cases.
Q4: Does wearing a mask help?
In crowded, enclosed environments, it can reduce the risk of inhaling droplets. Combined with handwashing and avoiding touching your face, it is more effective.
Q5: When should I see a doctor?
If you develop shortness of breath, chest pain, wheezing, a persistent high fever, poor alertness in an infant, or rapid deterioration in an older person or someone with a chronic illness, you should seek medical attention.

This English version of this article has been generated by machine translation powered by AI. It is provided solely for reference purposes. In the event of any discrepancy or inconsistency between this translation and the original Chinese version, the Chinese version shall prevail.