Adenoviral Pharyngoconjunctival Fever: This is the most likely diagnosis given the specific mention of it. Adenoviral pharyngoconjunctival fever is characterized by fever, pharyngitis, and conjunctivitis, which are symptoms that could be presented in the scenario.

Viral Pharyngitis: Other viruses like influenza, respiratory syncytial virus (RSV), and rhinovirus can cause similar symptoms, including sore throat and fever.
Conjunctivitis due to other causes: Bacterial conjunctivitis (e.g., caused by Staphylococcus aureus, Haemophilus influenzae, or Streptococcus pneumoniae) or allergic conjunctivitis could present with eye symptoms similar to those of adenoviral pharyngoconjunctival fever.
Infectious Mononucleosis: Caused by Epstein-Barr virus, it can present with fever, sore throat, and sometimes conjunctivitis, although the latter is less common.

Streptococcal Pharyngitis: Although less likely to cause conjunctivitis, streptococcal pharyngitis (caused by Group A beta-hemolytic streptococcus) is a critical diagnosis not to miss due to the risk of rheumatic fever and glomerulonephritis if left untreated.
Diphtheria: A bacterial infection caused by Corynebacterium diphtheriae, which can lead to severe respiratory and cardiac complications if not promptly treated.
Kawasaki Disease: An acute febrile illness of childhood that can lead to coronary artery aneurysms if not recognized and treated early.

Newcastle Disease: A rare viral infection that can cause conjunctivitis and influenza-like symptoms, primarily in individuals who handle birds or their products.
Enteroviral Infections: Certain enteroviruses can cause aseptic meningitis, encephalitis, or acute flaccid paralysis, and some may present with pharyngoconjunctival symptoms, although this is less common.
Leptospirosis: A bacterial infection that can cause a wide range of symptoms, including fever, headache, and conjunctivitis, especially in individuals exposed to contaminated water.