Recently, there has been a noticeable increase in the number of patients visiting emergency and outpatient departments across multiple hospitals in China. A significant portion of these patients are children, with a rising trend in respiratory infections caused by various pathogens, including but not limited to Mycoplasma pneumoniae.
Dr. Hongzhou Lu, Director of the National Clinical Research Center for Infectious Diseases and President of Shenzhen Third People's Hospital, reported that following the National Day holiday, the hospital saw a high positive rate of Mycoplasma pneumoniae (34.33%) in respiratory pathogen nucleic acid tests. Other prevalent pathogens included Influenza A virus (12.17%), Influenza B virus (5.79%), Adenovirus (2.76%), and Respiratory Syncytial Virus (RSV) (2.03%). Dr. Lu emphasized that young children are at a higher risk of co-infections, such as those involving Adenovirus and Streptococcus pneumoniae, which can exacerbate symptoms if combined with Mycoplasma pneumoniae. Parents should be vigilant and seek medical attention if their children show signs of severe or worsening symptoms.
Beyond Mycoplasma pneumoniae and SARS-CoV-2, what other infectious diseases should be on our radar, and how can we prevent them?
1. Influenza Viruses
Mycoplasma pneumoniae and influenza viruses share some similarities, leading to frequent confusion. While influenza is caused by a virus, Mycoplasma pneumoniae is a type of microorganism that is neither bacterial nor viral. The treatment approaches for these two conditions are entirely different, making accurate diagnosis crucial.
Dr. Chunming Jiang, Head of Pediatrics at Hangzhou First People's Hospital, explained that the symptoms of influenza, particularly Influenza A and B, typically include high fever, sore throat, nasal congestion, runny nose, and generalized body aches and headaches. In contrast, Mycoplasma pneumoniae infection can be more insidious, often presenting without a high fever. Some children may only have a low-grade fever or no fever at all, with normal blood counts and C-reactive protein (CRP) levels, making it easy to miss. However, Mycoplasma pneumoniae infection is characterized by severe coughing and, in some cases, wheezing.
Prevention
The most effective and cost-efficient way to prevent influenza is through vaccination. Flu vaccines significantly reduce the risk of contracting the flu and developing serious complications.
2. Respiratory Syncytial Virus (RSV)
RSV is a leading cause of acute lower respiratory tract infections in children under five years old worldwide. This RNA virus undergoes annual mutations, leading to repeated infections. RSV is highly contagious, spreading through coughs, sneezes, and close contact, and can survive on surfaces like desks and toys for several hours.
Most healthy children infected with RSV experience mild symptoms similar to a common cold, such as nasal congestion, coughing, sneezing, and a low-grade fever. As the infection progresses, severe cases may develop breathing difficulties, rapid breathing, wheezing, irritability, and loss of appetite, potentially leading to respiratory and heart failure.
Prevention
RSV affects all age groups and cannot be prevented by vaccination. It follows a seasonal pattern, peaking in northern China from November to April, with the highest incidence in January and February. The incubation period is typically 2 to 8 days, with symptoms appearing 4 to 6 days after infection. For children with normal immune function, mild RSV infections can be managed with home care.
3. Rhinovirus Infections
Rhinoviruses are the most common cause of the common cold, with over 120 serotypes identified. They are responsible for nearly half of all acute respiratory infections.
Rhinoviruses are highly contagious and can infect people of all ages, with children being particularly susceptible. The incubation period ranges from 12 hours to 5 days, typically around 48 hours. Transmission occurs through direct contact, droplets, and contaminated hands and objects.
Rhinoviruses primarily affect the upper respiratory tract, causing symptoms such as runny nose, sneezing, sore throat, nasal congestion, coughing, and a slight fever. Complications can include sinusitis and otitis media. Rhinoviruses can also co-infect with other pathogens like enteroviruses and Mycoplasma pneumoniae.
Prevention
Rhinovirus infections are self-limiting and generally do not require specific treatment. Rest, proper hydration, good ventilation, and hand hygiene are recommended. Most infections resolve within a week. Although local antibodies are produced, they provide short-term immunity, and reinfection is possible within the same year, though subsequent infections tend to be milder. Currently, there are no effective vaccines for rhinovirus infections.
4. Adenovirus Infections
Adenovirus infections are common during the winter and spring months, often causing outbreaks in schools and daycare centers. These viruses spread through respiratory droplets, eye secretions, and contact with contaminated surfaces. Gastrointestinal infections are transmitted via the digestive tract.
Typical symptoms of adenovirus respiratory infections include coughing, nasal congestion, and pharyngitis, along with fever, chills, headache, and muscle aches. More severe cases can lead to pharyngitis, conjunctivitis, and pneumonia. Some adenovirus types can also cause gastroenteritis in infants and young children, resulting in abdominal pain, diarrhea, and, in rare cases, intussusception.
Prevention
Dr. Tongzeng Li, Deputy Chief Physician in the Department of Infectious Diseases at Beijing Youan Hospital, Capital Medical University, noted that adenovirus infections are usually self-limiting, with most individuals recovering within 7 days. Adequate rest and hydration are sufficient for most cases. However, immunocompromised individuals or those with severe symptoms may require antiviral medications as prescribed by a healthcare provider.
After an adenovirus infection, individuals develop protective neutralizing antibodies, providing long-lasting immunity against the specific serotype.
5. Streptococcus pneumoniae
Streptococcus pneumoniae is a bacterium that can colonize the human upper respiratory tract without causing symptoms. It is a major cause of invasive diseases such as meningitis, sepsis, and pneumonia, as well as non-invasive diseases like otitis media and sinusitis. Pneumonia caused by this bacterium accounts for over 50% of all pneumonia cases.
Infants, young children, and older adults, especially those over 65, are at higher risk due to their weaker immune systems. Individuals with chronic conditions like liver disease, heart disease, and diabetes, as well as those with compromised immune systems, are also more susceptible.
Prevention
Vaccination is the most effective and economical method to prevent pneumococcal diseases. Two types of pneumococcal vaccines are currently available: the 23-valent and 13-valent pneumococcal vaccines, which cover 23 and 13 serotypes, respectively. The 23-valent vaccine is recommended for individuals over 2 years old who are at increased risk of pneumococcal disease, with a single dose for primary immunization. The 13-valent vaccine is for children aged 6 weeks to 5 years, protecting against 13 serotypes and particularly effective against invasive pneumococcal diseases. Both vaccines are non-routine in most regions of China.
In the fall and winter seasons, children are more vulnerable to a variety of viral and bacterial infections, which can present with similar symptoms such as fever, cough, and runny nose. However, the underlying causes and appropriate treatments can vary significantly. Parents often attempt to diagnose and treat their children's symptoms at home, which can lead to misdiagnosis and inappropriate treatment, potentially worsening the condition, especially in cases of co-infections. Therefore, it is essential for parents to seek professional medical advice and follow the prescribed treatment plan. Healthcare providers can offer the most suitable treatment based on the child's specific condition and closely monitor their progress.