Human health concerns by pest

American cockroach

Periplaneta americana

• Infestations can expose occupants to allergens and aggravate asthma.
• Food and preparation surfaces require protection from crawling insects.

Ant Control in San Diego Homes

• Most household ants are nuisance food invaders; fire ants sting and carpenter or velvety tree ants can bite.
• Pharaoh ants warrant special hygiene attention in healthcare areas.

Argentine ant

Linepithema humile

• Primarily nuisance and food-invasion concerns, not a major direct human hazard.

Asian tiger mosquito

Aedes albopictus

• Bites can cause itchy skin reactions.
• Infected Asian tiger mosquitoes can transmit dengue, chikungunya and Zika viruses; seeing the species does not establish local disease transmission.

Bed Bugs in San Diego

Cimex lectularius

• Bites can itch and trigger allergic inflammation. Scratching can damage skin; sleep disruption and anxiety are additional concerns. Bed bugs are not known to transmit disease to people.

Big-headed ant

Pheidole megacephala

• Primarily nuisance and food-invasion concerns, not a major direct human hazard.

Black carpet beetle

Attagenus unicolor

• Larval hairs can cause itchy allergic dermatitis; this is not a bite.
• Sensitive people can develop eye or respiratory irritation.

Black Polycaon beetle

Polycaon stoutii

• The principal concern is wood damage, not a human parasite or household disease-vector claim.

Brown marmorated stink bugs

Halyomorpha halys

• This bug does not ordinarily bite or sting and is not known to transmit human disease.
• Its defensive odor or crushed secretions can cause skin, eye or nasal allergic irritation in sensitive people.

Brown widow

Latrodectus geometricus

• Bites usually have less severe effects than western black-widow bites, but can cause pain and a local reaction. Misidentification can conceal a more serious exposure.

Brownbanded cockroach

Supella longipalpa

• Infestations can expose occupants to allergens and aggravate asthma.
• Food and preparation surfaces require protection from crawling insects.

California common scorpion

Paruroctonus silvestrii

• Stings can cause pain and local inflammation, and allergy is possible. The severe bark-scorpion syndrome should not be automatically attributed to California common scorpions. Uncertain identification is a reason for medical advice.

Camponotus clarithorax carpenter ant

Camponotus clarithorax

• Bites can hurt; formic acid adds burning. They do not sting.
• Wood excavation is a property-safety concern separate from infection.

Camponotus vicinus carpenter ant

Camponotus vicinus

• Bites can hurt; formic acid adds burning. They do not sting.
• Wood excavation is a property-safety concern separate from infection.

Carpenter ants

• Painful bites and burning from defensive acid; extensive nests may weaken wood.

Carpenter bees

• Males cannot sting; females may sting if handled or provoked.
• Repeated nesting can weaken wood; avoid treating this as merely a cosmetic issue.

Carpet beetles

• Larval hairs may cause dermatitis and eye or airway irritation; larvae do not bite people.

Casemaking clothes moth

Tinea pellionella

• The principal harm is fabric damage, not blood-feeding or household disease transmission.
• Control chemicals can create greater exposure concerns than the moths themselves.

Centipedes

• Larger centipedes can deliver painful bites with local swelling; house centipedes are beneficial predators.

Cigarette beetle

Lasioderma serricorne

• Infested products contain insects and their waste; do not keep them as food.

Clothes moths

• Fabric damage is the principal concern; misuse of mothballs introduces a separate chemical hazard.

Cockroach Control in San Diego

• Allergen exposure and asthma aggravation are important in indoor infestations; protect food-contact areas too.

Common household spiders

• Most household spiders are not a major health threat. California's important serious bite concern is the black widow; unexplained skin lesions alone do not establish a spider bite.

Common silverfish

Lepisma saccharina

• Food, paper and fabric damage are the relevant household concerns; these are not blood-feeding pests.

Conenose bugs

• Blood-feeding bites can cause itching and occasionally a serious allergic reaction.
• Some conenose bugs carry the Chagas parasite; infected feces entering broken skin or mucous membranes can transmit it.
• Locally acquired infection is uncommon in the United States; finding an insect or a bite does not diagnose Chagas disease.

Confused flour beetle

Tribolium confusum

• Infested products contain insects and their waste; do not keep them as food.

Deer Mouse Identification, Hantavirus Precautions and Control

Peromyscus gambelii

• Infected deer mice can shed Sin Nombre hantavirus in urine, droppings and saliva.
• Breathing contaminated particles can cause serious pulmonary illness.
• Finding a deer mouse does not prove that it is infected or that anyone has contracted hantavirus.

Drain flies

• They do not bite, but flies from sewage or decaying material may transfer contamination to food or sterile areas.
• Large accumulations of dead flies can contribute allergens.

Drugstore beetle

Stegobium paniceum

• Infested products contain insects and their waste; do not keep them as food.

Drywood Termites in San Diego

• Damaged load-bearing wood and treatment exposure are the practical safety priorities.

Earwigs

• Indoor groups are annoying but not an established health hazard.

European earwig

Forficula auricularia

• Indoor accumulations are a nuisance, not an established health hazard.

European paper wasp

Polistes dominula

• A defensive sting can cause local pain or a severe allergic reaction. Paper wasps are generally less defensive than yellowjackets, but an occupied nest near a doorway remains a contact hazard.

Field cockroach

Blattella vaga

• An outdoor visitor is not equivalent to an established indoor roach infestation.
• Remove insects from food-contact areas; assess recurring indoor activity before assuming species-specific disease risk.

Firebrat

Thermobia domestica

• Food, paper and fabric damage are the relevant household concerns; these are not blood-feeding pests.

Firebrats

• Damage to dry food, paper and fabric matters; these pests do not feed on human blood.

Flea Control in San Diego Homes

Ctenocephalides felis

• Cat flea bites can cause itchy reactions. Infected cat fleas can participate in flea-borne typhus transmission; finding fleas does not prove infection. Scratching bites increases skin injury risk.

Formosan subterranean termite

Coptotermes formosanus

• The principal concern is damaged wood, not a household disease-vector claim.
• Inspection and treatment introduce separate risks from unsafe access or pesticide misuse.

Fungus gnats

• Adult fungus gnats do not bite people; their main human impact is nuisance.

Furniture carpet beetle

Anthrenus flavipes

• Larval hairs can cause itchy allergic dermatitis; this is not a bite.
• Sensitive people can develop eye or respiratory irritation.

German cockroach

Blattella germanica

• Infestations can expose occupants to allergens and aggravate asthma.
• Food and preparation surfaces require protection from crawling insects.

House and blow flies

• House flies can contaminate food with microbes acquired from waste. Little house flies chiefly cause nuisance and are not considered significant human-disease carriers; not every fly has the same risk.

House centipede

Scutigera coleoptrata

• This beneficial predator is not a property-damaging household pest.
• Avoid handling: centipede bite risks should not be exaggerated from larger species.

House fly

Musca domestica

• House flies cannot bite, but can transfer disease-causing microbes from waste onto food and food-contact surfaces.

House Mouse Control in San Diego

Mus musculus

• Infected house mice can spread lymphocytic choriomeningitis virus through contaminated excretions and nesting material.
• LCMV infection is especially important during pregnancy or for people with weakened immune systems.
• Mice can contaminate food, and bites or scratches can introduce infection.

Immigrant pavement ant

Tetramorium immigrans

• Primarily nuisance and food-invasion concerns, not a major direct human hazard.

Indianmeal moth

Plodia interpunctella

• Larvae leave webbing, waste and insect material in food.

Leadcable borer

Scobicia declivis

• The principal concern is wood damage, not a human parasite or household disease-vector claim.

Liometopum luctuosum velvety tree ant

Liometopum luctuosum

• Velvety tree ants are aggressive biters; avoid direct contact.

Little house fly

Fannia canicularis

• This fly is primarily a hovering nuisance and is not considered an important human-disease carrier. Its waste-associated breeding sites still need sanitation.

Merchant grain beetle

Oryzaephilus mercator

• Infested products contain insects and their waste; do not keep them as food.

Millipedes

• They do not bite; defensive secretions of some species irritate skin and eyes.

Mosquitoes around a San Diego house

• Bite reactions and mosquito-borne infection are separate concerns. County guidance identifies West Nile risk from native Culex and virus-transmission potential from invasive Aedes; risk depends on infected mosquitoes, not bites alone.

Norway Rats in San Diego

Rattus norvegicus

• Urine, droppings and saliva can contaminate food and surfaces.
• Bites, scratches or contact with an infected rodent can transmit rat-bite fever.
• Chewed wiring creates a separate household fire or electrical hazard requiring qualified assessment.

Odorous house ant

Tapinoma sessile

• Primarily nuisance and food-invasion concerns, not a major direct human hazard.

Old world lyctus beetle

Lyctus brunneus

• The principal concern is wood damage, not a human parasite or household disease-vector claim.

Oriental cockroach

Blatta orientalis

• Infestations can expose occupants to allergens and aggravate asthma.
• Food and preparation surfaces require protection from crawling insects.

Pacific deathwatch beetle

Hemicoelus gibbicollis

• The principal concern is wood damage, not a human parasite or household disease-vector claim.

Pantry Bugs

• Insect fragments, waste and webbing contaminate stored food; warehouse-beetle hairs add an irritation risk.

Pharaoh ant

Monomorium pharaonis

• Food contamination matters: these ants can carry germs through buildings.
• Healthcare infestations require prompt facility management because ants may reach vulnerable patients and wounds.

Rat Control in San Diego

• Urine, droppings and saliva can contaminate food and surfaces. Rodent bites or scratches can introduce infection; infected rodents can transmit rat-bite fever. Appearance cannot establish whether an animal carries germs.

Red flour beetle

Tribolium castaneum

• Infested products contain insects and their waste; do not keep them as food.

Red imported fire ant

Solenopsis invicta

• Painful stings; venom allergy can become a medical emergency.

Red-marked conenose

Triatoma rubida

• Blood-feeding bites can cause itching and occasionally a serious allergic reaction.
• Some conenose bugs carry the Chagas parasite; infected feces entering broken skin or mucous membranes can transmit it.
• Locally acquired infection is uncommon in the United States; finding an insect or a bite does not diagnose Chagas disease.

Roof Rats in San Diego

Rattus rattus

• Urine, droppings and saliva can contaminate food and surfaces.
• Bites, scratches or contact with an infected rodent can transmit rat-bite fever.
• Chewed wiring creates a separate household fire or electrical hazard requiring qualified assessment.

Sawtoothed grain beetle

Oryzaephilus surinamensis

• Infested products contain insects and their waste; do not keep them as food.

Scorpions

• Stings can cause pain and local inflammation, and allergy is possible. The severe bark-scorpion syndrome should not be automatically attributed to California common scorpions. Uncertain identification is a reason for medical advice.

Silverfish

• Damage to dry food, paper and fabric matters; these pests do not feed on human blood.

Southern fire ant

Solenopsis xyloni

• Painful stings; venom allergy can become a medical emergency.

Southern house mosquito

Culex quinquefasciatus

• Bites can irritate skin. Native Culex mosquitoes can transmit West Nile virus if infected; a mosquito sighting does not establish infection or a neighborhood outbreak.

Southern lyctus beetle

Lyctus planicollis

• The principal concern is wood damage, not a human parasite or household disease-vector claim.

Springtails

• They do not bite people, spread disease or harm furnishings.

Striped earwig

Labidura riparia

• Indoor accumulations are a nuisance, not an established health hazard.

Subterranean Termites in San Diego

• Damaged load-bearing wood and treatment exposure are the practical safety priorities.

Thief ant

Solenopsis molesta

• Primarily nuisance and food-invasion concerns, not a major direct human hazard.

Turkestan cockroach

Blatta lateralis

• Infestations can expose occupants to allergens and aggravate asthma.
• Food and preparation surfaces require protection from crawling insects.

Varied carpet beetle

Anthrenus verbasci

• Larval hairs can cause itchy allergic dermatitis; this is not a bite.
• Sensitive people can develop eye or respiratory irritation.

Warehouse beetle

Trogoderma variabile

• Larval hairs in eaten food can irritate the mouth, throat or stomach.

Webbing clothes moth

Tineola bisselliella

• The principal harm is fabric damage, not blood-feeding or household disease transmission.
• Control chemicals can create greater exposure concerns than the moths themselves.

Western black carpenter ant

Camponotus modoc

• Bites can hurt; formic acid adds burning. They do not sting.
• Wood excavation is a property-safety concern separate from infection.

Western black widow

Latrodectus hesperus

• A bite can produce substantial pain, muscle cramping and sweating. Serious envenomation mainly concerns adult females; bites are uncommon.

Western bloodsucking conenose

Triatoma protracta

• Blood-feeding bites can cause itching and occasionally a serious allergic reaction.
• Some conenose bugs carry the Chagas parasite; infected feces entering broken skin or mucous membranes can transmit it.
• Locally acquired infection is uncommon in the United States; finding an insect or a bite does not diagnose Chagas disease.

Western boxelder bug

Boisea rubrolineata

• A nuisance visitor; it does not injure people or pets.

Western drywood termite

Incisitermes minor

• The principal concern is damaged wood, not a household disease-vector claim.
• Inspection and treatment introduce separate risks from unsafe access or pesticide misuse.

Western encephalitis mosquito

Culex tarsalis

• Bites can irritate skin. Native Culex mosquitoes can transmit West Nile virus if infected; a mosquito sighting does not establish infection or a neighborhood outbreak.

Western honey bee

Apis mellifera

• Honey-bee stings cause local pain and can trigger life-threatening venom allergy. A defensive colony can inflict multiple stings.

Western lyctus beetle

Lyctus cavicollis

• The principal concern is wood damage, not a human parasite or household disease-vector claim.

Western subterranean termite

Reticulitermes hesperus

• The principal concern is damaged wood, not a household disease-vector claim.
• Inspection and treatment introduce separate risks from unsafe access or pesticide misuse.

Western velvety tree ant

Liometopum occidentale

• Velvety tree ants are aggressive biters; avoid direct contact.

Western yellowjacket

Vespula pensylvanica

• Repeated stings can cause pain and swelling. Venom allergy can be life-threatening; many stings can also cause serious toxicity without a known allergy.

Widow spiders

• Western black-widow venom can cause systemic pain and muscle symptoms; brown-widow bites generally have milder effects. A rash alone cannot identify a spider bite.

Wood-boring beetles

• The main harm is weakened wood; careless inspection, dust disturbance or treatment can add safety risks.

Yellow fever mosquito

Aedes aegypti

• Bites cause itchy skin reactions. This species can transmit dengue, Zika, chikungunya and yellow-fever viruses when infected; species presence alone is not evidence of local transmission of those diseases.

Yellowjackets and social wasps

• Stings can cause local inflammation, venom allergy or serious effects from multiple stings. Wasps can sting repeatedly.