Who needs a flu shot? How long is mono contagious? Find out about infections that teens can get, with information about how they're spread, signs & symptoms, when to go to the doctor, and more.

Common Infections

• 5 Ways to Fight the Flu
• Adenoids and Adenoidectomy
• Cold Sores (HSV-1)
• Coping With Colds
• Germs: Bacteria, Viruses, Fungi, and Protozoa
• Head Lice
• How Long Is Mono Contagious?
• Ingrown Toenails
• Mononucleosis (Mono)
• Pinkeye (Conjunctivitis)
• Sinusitis
• The Flu
• Tonsillectomy
• Tonsillitis
• Urinary Tract Infections
• What's the Difference Between Infectious and Contagious?

Colds & Flu

• 5 Tips for Dealing With Shots
• 5 Ways to Fight the Flu
• Coping With Colds
• Flu Center
• Germs: Bacteria, Viruses, Fungi, and Protozoa
• I'm Pregnant. Should I Get a Flu Shot?
• Sinusitis
• The Flu
• The Flu Vaccine
• When Can I Go Back to School If I Have the Flu?

Bacteria & Viruses

• Bacterial Vaginosis
• Cellulitis
• Cholera
• Cold Sores (HSV-1)
• Coping With Colds
• Dengue Fever
• Diarrhea
• E. Coli Infections: Diarrhea
• Encephalitis
• Fighting Germs
• Food Poisoning
• Germs: Bacteria, Viruses, Fungi, and Protozoa
• Hepatitis A
• Hepatitis B
• Hepatitis C
• How Can I Prevent Lyme Disease?
• How Long Is Mono Contagious?
• Impetigo
• Lyme Disease
• MRSA
• Meningitis
• Molluscum Contagiosum
• Osteomyelitis
• Peritonsillar Abscess
• Pinkeye (Conjunctivitis)
• Pneumonia
• PrEP (Pre-Exposure Prophylaxis)
• Rocky Mountain Spotted Fever
• Salmonellosis
• Sinusitis
• Skin Abscesses
• Smallpox
• Strep Test (Video)
• Strep Throat
• Swimmer's Ear (External Otitis)
• Tetanus
• The Flu
• Tonsillitis
• Toxic Shock Syndrome
• Urinary Tract Infections
• Warts
• What's the Difference Between Infectious and Contagious?

Fungal Infections

• Athlete's Foot
• Fighting Germs
• Germs: Bacteria, Viruses, Fungi, and Protozoa
• Jock Itch
• Pityriasis Versicolor
• Ringworm
• Vaginal Yeast Infections
• What's the Difference Between Infectious and Contagious?

Sexually Transmitted Diseases

• Bacterial Vaginosis
• Chlamydia
• Fighting Germs
• Genital Herpes
• Genital Warts (HPV)
• Gonorrhea
• HIV and AIDS
• HPV Vaccine
• Hepatitis
• Hepatitis B
• How Do People Get AIDS?
• How to Get Tested for HIV
• Pelvic Inflammatory Disease (PID)
• PrEP (Pre-Exposure Prophylaxis)
• Pubic Lice (Crabs)
• STDs (Sexually Transmitted Diseases)
• Syphilis
• Trichomoniasis

Skin Infections & Rashes

• Athlete's Foot
• Bedbugs
• Cellulitis
• Cold Sores (HSV-1)
• Eczema
• Head Lice
• How Can I Prevent Lyme Disease?
• Impetigo
• Jock Itch
• Lyme Disease
• Molluscum Contagiosum
• Pityriasis Versicolor
• Ringworm
• Rocky Mountain Spotted Fever
• Skin Abscesses
• Smallpox
• Toxic Shock Syndrome
• What's the Difference Between Infectious and Contagious?

Stomach & Intestinal Infections

• Diarrhea
• E. Coli Infections: Diarrhea
• Food Poisoning
• Salmonellosis
• Stomachaches
• What's the Difference Between Infectious and Contagious?

Note: All information is for educational purposes only. For specific medical advice, diagnoses, and treatment, consult your doctor.

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