eTable 1. Search algorithm of the systematic database interrogation.

	Medline via PubMed	Embase via Ovid
1)	nursery nurse[tw] OR nursery teacher[tw] OR nursery-school teacher[tw] OR kindergarten[tw] OR nurser*[tw] OR schools, nursery[mh] OR nurseries[mh] OR child care[tw] OR child care[mh] OR infant care[tw] OR infant care[mh] OR child day*care center[tw] OR child day care centers[mh] OR preschool teacher[tw] OR preschool work*[tw] OR preschool educat*[tw] OR education work*[tw] OR family day care[tw] OR in-home day care[tw] OR family day homes[tw] OR private home child care[tw] OR baby minder[tw] OR child minder[tw] OR day-care mother[tw] OR day nanny[tw] OR early childhood educat*[tw] OR day*care worker[tw]	(nursery nurse$.mp.) OR (nursery adj1 teacher$.mp.) OR (kindergarten.mp.) OR (exp nursery school/) OR (child adj1 care.mp.) OR (exp child care/) OR (infant adj1 care.mp.) OR (child day care center$.mp.) OR (exp day care/) OR (preschool teacher$.mp.) OR (preschool educat$.mp.) OR (preschool work$.mp.) OR (education work$.mp.) OR (family day care.mp.) OR (in-home day care.mp.) OR (family day homes.mp.) OR (private home child care.mp.) OR (baby minder.mp.) OR (child minder.mp.) OR (day-care mother.mp.) OR (day nanny.mp.) OR (early childhood educat$.mp.) OR (day$care worker.mp.)
2)	mumps[tiab] OR “mumps virus”[mh] OR measles[tiab] OR “measles virus”[mh] OR rubeola[tiab] OR rubella[tiab] OR “rubella virus”[mh] OR “whooping cough”[tiab] OR “whooping cough”[mh] OR pertussis[tiab] OR “bordetella pertussis”[mh] OR chickenpox[tiab] OR varicella[tiab] OR “varicella zoster”[tiab] OR “herpesvirus 3, human”[mh] OR “hepatitis A”[tiab] OR “hepatitis B”[tiab] OR diphtheria[tiab] OR polio[tiab] OR poliomyelitis[tiab] OR “infantile paralysis”[tiab] OR Poliomyelitis[mh] OR “Haemophilus ‧influenzae type b”[tiab] OR „Pneumococcal Infections“[mh] OR „pneumococcal“[tiab] OR “Meningococcal infection”[tiab] OR “Meningococcal disease*”[tiab] OR Meningitis[tiab] OR “Meningitis, Meningococcal”[mh] OR ‧rotavirus[tiab] OR influenza[tiab] OR “tick-borne encephalitis”[tiab] OR „Encephalitis, Tick-Borne“[mh] OR „Encephalitis Viruses, Tick-Borne“[mh] OR rabies[tiab] OR tetanus[tiab] OR cytomegaly[tiab] OR cytomegalovirus[tiab] OR “parvovirus b19”[tiab] OR “fifth disease”[tiab] OR borreliosis[tiab] OR “lyme disease*”[tiab] OR “borrelia infections”[mh] OR “epstein-barr-virus”[tiab] OR “eb virus”[tiab] OR “Epstein-Barr Virus Infections”[mh] OR “human herpesvirus 4”[tiab] OR “Herpesvirus 4, Human”[mh] OR “hepatitis C”[tiab] OR “hepatitis D”[tiab] OR “hepatitis E”[tiab] OR “hepatitis G”[tiab] OR “herpes simplex virus”[tiab] OR “human herpesvirus 1”[tiab] OR “human herpesvirus 2”[tiab] OR “HSV-1”[tiab] OR “HSV-2”[tiab] OR “HHV-1”[tiab] OR “HHV-2”[tiab] OR Simplexvirus[mh] OR legionella[tiab] OR legionellosis[tiab] OR “legionnaire* disease”[tiab] OR “pontiac fever”[tiab] OR “Mycoplasma pneumoniae“[tiab] OR “Mycoplasma hominis”[tiab] OR “Ureaplasma urealyticum”[tiab] OR ((Enteritis[mh] OR enteritis[tiab]) AND (“enterohemorrhagic Escherichia coli”[mh] OR “enterohemorrhagic Escherichia coli”[tiab] OR “enterohemorrhagic E* coli”[tiab] OR “enterohaemorrhagic Escherichia coli”[tiab] OR “enterohaemorrhagic E* coli”[tiab] OR EHEC[tiab])) OR Shigella[tiab] OR Shigellosis[tiab] OR “bacillary dysentery”[tiab] OR “Dysentery, Bacillary”[mh] OR “Streptococcus pyogenes”[tiab] OR scarlet[tiab] OR “Streptococcus pneumoniae”[tiab] OR „Pneumococcal Infections“[mh] OR “Staphylococcus aureus”[tiab] OR “impetigo contagiosa”[tiab] OR impetigo[tiab] OR impetigo[mh] OR Salmonella[tiab] OR Salmonella[mh] OR Salmonellosis[tiab] OR “Salmonella Infections”[mh] OR Hantavirus[tiab] OR Hantavirus[mh] OR “Hantavirus Infections”[mh] OR HFRS[tiab] OR HPS[tiab] OR HCPS[tiab] OR “head louse”[tiab] OR “pediculus humanus capitis”[tiab] OR Pediculus[mh] OR scabies[tiab] OR Cryptosporidiosis[tiab] OR crypto[tiab] OR cryptosporidium[tiab] OR conjunctivitis[tiab] OR “pink eye”[tiab] OR Conjunctivitis[mh] OR “giardia lamblia”[tiab] OR giardiasis[tiab] OR “beaver fever”[tiab] OR tuberculosis[tiab] OR „Toxoplasmosis“[mh] OR toxoplasmosis[tiab] OR „HIV“[Mesh] OR HIV[tiab]	(mumps.ti,ab.) or (exp Mumps virus/) or (measles.ti,ab.) or (exp Measles virus/) or (rubeola.ti,ab.) or (rubella.ti,ab.) or (exp Rubella virus/) or (whooping cough.ti,ab.) or (pertussis.ti,ab.) or (exp pertussis/) or (chickenpox.ti,ab.) or (varicella.ti,ab.) or (exp chickenpox/) or (human herpesvirus 3.ti,ab.) or (hepatitis a.ti,ab.) or (hepatitis b.ti,ab.) or (diphteria.ti,ab.) or (exp diphtheria/) or (polio$.ti,ab.) or (exp Poliomyelitis virus/) or (exp poliomyelitis/) or (infantile paralysis.ti,ab.) or (Haemophilus influenzae type b.ti,ab.) or (exp pneumococcal infection/) or (pneumococcal.ti,ab.) or (meningococcal disease.ti,ab.) or (exp meningococcosis/) or (exp meningitis/) or (meningitis.ti,ab.) or (rotavirus.ti,ab.) or (exp Rotavirus/) or (influenza.ti,ab.) or ‧(tick-borne encephalitis.ti,ab.) or (rabies.ti,ab.) or (tetanus.ti,ab.) or (Cytomegal$.ti,ab.) or (parvovirus b19.ti,ab.) or (borreli$.ti,ab.) or (lyme disease$.ti,ab.) or (exp borrelia infection/) or (epstein-barr-virus.ti,ab.) or (eb virus.ti,ab.) or (exp Epstein Barr virus/) or (human herpesvirus 4.ti,ab.) or (hepatitis c.ti,ab.) or (hepatitis d.ti,ab.) or (hepatitis e.ti,ab.) or (hepatitis g.ti,ab.) or (Herpes Simplex Virus.ti,ab.) or (human herpesvirus 1.ti,ab.) or (human herpesvirus 2.ti,ab.) or (HSV-1.ti,ab.) or (HSV-2.ti,ab.) or (HVV-1.ti,ab.) or (HVV-2.ti,ab.) or (exp Herpes simplex virus/) or (legionella.ti,ab.) or (legionellosis.ti,ab.) or (legionnaire$ disease.ti,ab.) or (exp legionnaire disease/) or (Mycoplasma pneumoniae.ti,ab.) or (Mycoplasma hominis.ti,ab.) or (Ureaplasma urealyticum.ti,ab.) or (((exp enteritis/) or (enteritis.ti,ab.)) and ((exp enterohemorrhagic Escherichia coli/) or (enteroh?emorrhagic E$ coli.ti,ab.) or (EHEC.ti,ab.))) or (shigella.ti,ab.) or (shigellosis.ti,ab.) or (bacillary dysentery.ti,ab.) or (exp shigellosis/) or (Streptococcus pyogenes.ti,ab.) or (scarlet.ti,ab.) or (Streptococcus pneumoniae.ti,ab.) or (pneumococcal infection.ti,ab.) or (exp pneumococcal infection/) or ‧(impetigo.ti,ab.) or (exp impetigo/) or (Staphylococcus aureus.ti,ab.) or (exp Staphylococcus aureus/) or (salmonella.ti,ab.) or (exp Salmonella enterica serovar Enteritidis/) or (exp salmonellosis/) or (salmonellosis.ti,ab.) or (hantavirus.ti,ab.) or (exp Hantavirus infection/) or (exp Hantavirus/) or (HFRS.ti,ab.) or (HPS.ti,ab.) or (HCPS.ti,ab.) or (head louse.ti,ab.) or (head lice.ti,ab.) or (Pediculus humanus capitis.ti,ab.) or (scabies.ti,ab.) or (Cryptosporidiosis.ti,ab.) or (cryptosporidium.ti,ab.) or (crypto.ti,ab.) or (exp conjunctivitis/) or (conjunctivitis.ti,ab.) or (pink eye.ti,ab.) or (giardiasis.ti,ab.) or (giardia lamblia.ti,ab.) or (exp Giardia intestinalis/) or (tuberculosis.ti,ab.) or (exp tuberculosis/) or (toxoplasmosis/) or (toxoplasmosis.ti,ab.) or (exp Human immunodeficiency virus/) or (hiv.ti,ab.)
3)	#1 AND #2	#1 AND #2
4)	#3 AND „2000/01/01“[DP] : „3000“[DP]	#3 AND 2000:2019.(sa_year).