Cat Litter (Toxoplasmosis)
Everyday exposureHome & environmentAlso called · 6 names▾▴
toxoplasmosis, toxo, cat poop, cat feces, kitty litter, litter box
Home and environmental exposure
General information · effects depend on amount, timing, and how it is used. About these sources
Research strength: 3 / 5
MotherToBaby explains that toxoplasmosis is an infection caused by Toxoplasma gondii and can come from infected cat feces, soil, water, or undercooked meat. For the cat-feces route, CDC says the parasite must be swallowed, such as after unwashed hands touch the mouth following contact with cat poop. A new infection during pregnancy can pass to the fetus; MotherToBaby says fetal transmission is more likely near delivery, while certain serious fetal problems are more likely when infection starts in the first trimester. MotherToBaby advises avoiding direct contact with cat feces, using gloves if changing litter, and washing hands right away; CDC recommends another household member clean the litter box if possible. MotherToBaby says to discuss individual risk, screening, testing, and treatment options with a provider. Ask your provider about your situation.
Last reviewed: 2026-10-14
Sources
- MotherToBaby: Toxoplasmosis fact sheetTeratology service
- CDC: People at Increased Risk for ToxoplasmosisUS government
- CDC: About Cleaning and Disinfecting Pet SuppliesUS government
- HealthyChildren.org, AAP: Toxoplasmosis during pregnancy
- Bonetti et al., Pathogens 2025: congenital toxoplasmosis cohortUS government
- Congenital toxoplasmosis review, 2025US government
Research strength: 3 / 5
MotherToBaby says toxoplasmosis can come from infected cat feces, contaminated soil or water, and undercooked meat. CDC says the cat-feces route involves swallowing the parasite after contact with contaminated hands or items, rather than touch alone. A new infection during pregnancy can pass to the fetus; MotherToBaby says transmission is more likely later in pregnancy, while certain serious fetal problems are more likely if infection starts in the first trimester. MotherToBaby gives no separate second-trimester estimate for a specific litter contact and advises gloves and handwashing if litter is changed. MotherToBaby also says to discuss personal risk, testing, and treatment options with a provider. Ask your provider about your situation.
Last reviewed: 2026-10-14
Sources
- MotherToBaby: Toxoplasmosis fact sheetTeratology service
- CDC: People at Increased Risk for ToxoplasmosisUS government
- CDC: About Cleaning and Disinfecting Pet SuppliesUS government
- HealthyChildren.org, AAP: Toxoplasmosis during pregnancy
- Bonetti et al., Pathogens 2025: congenital toxoplasmosis cohortUS government
- Congenital toxoplasmosis review, 2025US government
Research strength: 3 / 5
MotherToBaby says toxoplasmosis can spread from infected cat feces, soil, water, or undercooked meat. CDC says infection from cat feces involves swallowing the parasite after contact with contaminated hands or items. MotherToBaby says fetal transmission can happen at any point and is more likely closer to delivery, while certain serious fetal effects are more likely if infection begins earlier. MotherToBaby advises avoiding direct contact with cat feces, wearing gloves if changing litter, and washing hands right away; CDC recommends someone else clean the litter box if possible. MotherToBaby gives no third-trimester estimate for a specific litter contact and says to discuss testing and treatment options with a provider. Ask your provider about your situation.
Last reviewed: 2026-10-14
Sources
- MotherToBaby: Toxoplasmosis fact sheetTeratology service
- CDC: People at Increased Risk for ToxoplasmosisUS government
- CDC: About Cleaning and Disinfecting Pet SuppliesUS government
- HealthyChildren.org, AAP: Toxoplasmosis during pregnancy
- Bonetti et al., Pathogens 2025: congenital toxoplasmosis cohortUS government
- Congenital toxoplasmosis review, 2025US government
- D'Ambros et al., International Journal of Gynecology & Obstetrics 2026: Brazil cohortUS government
Cat Litter (Toxoplasmosis) — Breastfeeding
Research strength: 2 / 5
MotherToBaby states that Toxoplasma gondii passes into breast milk, but CDC says no human transmission through milk has been documented. CDC says breastfeeding can continue; it describes only a possible blood route if nipples are cracked or bleeding or breasts are inflamed, and says milk transmission is minimally likely. A 2015 case report described a mother and infant with toxoplasmosis, but the authors considered water exposure more likely than milk transfer; no LactMed record was found in the Bookshelf search. MotherToBaby suggests contacting the child's provider if an infant has fever or flu-like symptoms and discussing breastfeeding questions with a provider. Ask your provider about your situation.
Last reviewed: 2026-10-14
Pregnancy
MotherToBaby reports that a new Toxoplasma gondii infection during pregnancy can pass to the fetus. It says transmission is more likely closer to delivery, while certain serious fetal problems are more likely when infection starts in the first trimester. A 2025 review describes the same timing pattern: transmission is less likely early, but fetal effects can be more severe if early infection is transmitted. Bonetti et al. (2025) reviewed records from 247 pregnancies with confirmed infection; outcomes were available for 193 newborns after 56 were lost to follow-up. In this selected referral cohort, reported transmission was 0% after first-trimester infection, 12.5% after second-trimester infection, and 53.8% after third-trimester infection; prompt treatment and loss to follow-up limit how far these figures apply. D'Ambros et al. (2026) followed 55 mother-infant pairs with confirmed maternal infection, and 11 infants were diagnosed with congenital toxoplasmosis; the abstract did not identify litter as the infection source. These studies concern diagnosed maternal infection, not the risk from a particular amount or type of litter contact.
Breastfeeding
MotherToBaby states that Toxoplasma gondii passes into breast milk and says to continue breastfeeding unless nipple skin is broken or bleeding. CDC says no human breast-milk transmission has been documented; it describes a theoretical route through blood if nipples are cracked or bleeding or breasts are inflamed, and says the likelihood of milk transmission is minimal. A 2015 case report describes toxoplasmosis in a mother and her breastfed infant, but the authors considered shared water exposure more likely than milk transmission. A PubMed search for 14 Oct 2025 through 14 Oct 2026 found no human study documenting transmission through breast milk. No matching toxoplasmosis record was returned by the LactMed Bookshelf searches; this is a database search result, not proof that no future or unindexed record exists.
This is an exposure topic, not a medicine or a litter formula. MotherToBaby and CDC discuss Toxoplasma gondii in infected cat feces and other exposure routes; the pages reviewed do not identify a particular litter ingredient or brand as the cause.
What was tested
The pregnancy studies reviewed enrolled people with confirmed maternal infection and followed fetal or infant outcomes. Their abstracts do not isolate cat-litter brand, amount, or duration of contact, or distinguish litter from other exposure sources. The reported cohort rates therefore describe outcomes after maternal infection, not an individual estimate for changing a litter box.
Does Toxoplasma gondii pass into human breast milk?
- Source A says
- MotherToBaby states that Toxoplasma gondii passes into breast milk and reports that breastfeeding can continue unless nipple skin is broken or bleeding. (MotherToBaby: Toxoplasmosis fact sheet)
- Source B says
- CDC says no human breast-milk transmission has been documented. It describes a theoretical blood route with cracked or bleeding nipples or breast inflammation and says the likelihood of milk transmission is minimal. (CDC: Toxoplasmosis and Breastfeeding, Capobiango et al., Rev Inst Med Trop Sao Paulo 2015: acute toxoplasmosis in a breastfed infant with possible transmission by water)
- Why they differ
- MotherToBaby states parasite presence in milk as established, while CDC separates documented transmission from a theoretical blood-contamination route. The 2015 case report considered water exposure more likely than breast milk.
- Other sources
- CDC says a breastfeeding mother with toxoplasmosis can continue breastfeeding, with caution if nipples are cracked or bleeding. (CDC: Toxoplasmosis and Breastfeeding)
- What the evidence shows overall
- CDC supports continued breastfeeding, but the sources reviewed do not establish direct parasite transfer through human milk. The nipple-skin warning is described as a theoretical blood route, not as a documented milk-transmission event.
Can Toxoplasma be ruled out in cats that stay indoors?
- Source A says
- An ACOG FAQ says the infection is only found in cats that go outdoors and hunt prey. (ACOG Ask ACOG: Cat and pregnancy FAQ)
- Source B says
- CDC and AAP list other ways cats may acquire the parasite, including eating infected prey or raw meat and contact with contaminated soil. AAP says indoor cats fed commercial food are much less likely to be infected, not that they cannot be infected. (CDC: People at Increased Risk for Toxoplasmosis, HealthyChildren.org, AAP: Toxoplasmosis during pregnancy)
- Why they differ
- The ACOG FAQ was published and reviewed in October 2020 and uses categorical wording. CDC and AAP pages give a broader list of possible cat exposures and describe lower likelihood, rather than an absolute rule, for indoor cats fed commercial food.
- What the evidence shows overall
- Do not use the older FAQ to imply that only outdoor hunting cats can carry the parasite. The evidence reviewed supports saying that cat circumstances affect likelihood, without assigning a risk estimate to a particular household cat.
- CDC says another household member should clean the litter box if someone in the household is pregnant. If no one else can do it, CDC says to use disposable gloves and wash hands with soap and water immediately afterward. (CDC)
- MotherToBaby says not to touch cat feces directly; if changing litter, wear gloves and wash hands immediately afterward. (MotherToBaby)
- NHS advises avoiding cat feces in litter and soil where possible; if emptying a litter tray, wear gloves and wash hands afterward. (NHS)
- MotherToBaby says blood tests can diagnose toxoplasmosis and advises discussing individual risk, screening, testing, and treatment options with a healthcare provider. (MotherToBaby)
General research, not specific to pregnancy.
CDC reports that most people with healthy immune systems have no symptoms. Some people develop flu-like symptoms or swollen lymph nodes, while severe toxoplasmosis can affect the brain, eyes, or other organs.
- CDC says most people with healthy immune systems who get toxoplasmosis do not have symptoms; some may have flu-like symptoms, swollen lymph nodes, muscle aches, or pain. (CDC: About Toxoplasmosis)
- CDC says severe toxoplasmosis can damage the brain, eyes, or other organs. (CDC: About Toxoplasmosis)
- MotherToBaby: Toxoplasmosis fact sheetTeratology serviceSecondaryPage dated 2026-04-01
- CDC: Toxoplasmosis and BreastfeedingUS governmentSecondaryPage dated 2025-09-23Independent check
- CDC: People at Increased Risk for ToxoplasmosisUS governmentSecondaryPage dated 2025-02-14Independent check
- CDC: About Cleaning and Disinfecting Pet SuppliesUS governmentSecondaryPage dated 2026-02-18Independent check
- CDC: About ToxoplasmosisUS governmentSecondaryPage dated 2025-03-11Independent check
- HealthyChildren.org, AAP: Toxoplasmosis during pregnancySecondaryPage dated 2026-04-07Independent check
- NHS: ToxoplasmosisUK governmentSecondaryPage dated 2023-08-25Independent check
- ACOG Ask ACOG: Cat and pregnancy FAQProfessional societySecondaryPage dated October 2020Independent check
- Congenital toxoplasmosis review, 2025US governmentPrimaryIndependent check
- Bonetti et al., Pathogens 2025: Risk of Congenital Toxoplasmosis in Newborns from Mothers with Documented InfectionUS governmentPrimaryIndependent check
- D'Ambros et al., International Journal of Gynecology & Obstetrics 2026: Maternal and clinical predictors of congenital toxoplasmosisUS governmentPrimaryIndependent check
- Capobiango et al., Rev Inst Med Trop Sao Paulo 2015: acute toxoplasmosis in a breastfed infant with possible transmission by waterUS governmentPrimaryIndependent check
Last reviewed 2026-10-14
Independent check 2026-10-14
Not yet clinician-reviewed
Ask your provider about your situation.